1. Week 1
2. Biology, the Study of Life Quiz
Question 1
Correct Question text
Which of the following levels of taxonomy includes the greatest number of organisms?
Select one:
a. Class
b. Family
c. Species
d. Order
e. Phylum
Feedback
The correct answer is: Phylum
Question 2
Correct Question text
What is the basic unit of structure and function for all life?
Select one:
a. atom
b. molecule
c. cell
d. organ
e. organism
Feedback
The correct answer is: cell
Question 3
Correct
Question text
Members of the same species located within a particular area are called _ (blank) _.
Select one:
a. a community
b. an ecosystem
c. a population
d. an organism
e. a biosphere
Feedback
The correct answer is: a population
Question 4
Question text
Where do all organisms ultimately get their energy from?
Select one:
a. the sun
b. inorganic matter
c. organic matter
d. water
e. nutrient cycling
Feedback
The correct answer is: the sun
Question 5
Incorrect
Question text
Which of the following shows three taxonomic levels from most to least inclusive?
Select one:
a. species, genus, family
b. domain, kingdom, phylum
c. family, species, genus
d. phylum, domain, kingdom
e. family, class, species
Feedback
The correct answer is: domain, kingdom, phylum
Question 6
Correct
Question text
You discover a new group of organisms with the following characteristics: no nuclei to hold its DNA, mitochondria, rigid,
bacterial flagella. What level of classification would this new organism be placed under?
Select one:
a. Domain
b. Kingdom
c. Phylum
d. Genus
e. Species
Feedback
The correct answer is: Domain
Question 7
Correct
Question text
What is the main driving force behind evolution?
Select one:
a. natural selection
b. metabolism
c. homeostasis
d. photosynthesis
e. organization
Feedback
The correct answer is: natural selection
Question 8
Correct
Question text
The _ (blank) _ theory provides insight into why various species differ from one another, predisposition to diseases, and the production of drugs for diseases.
Select one:
a. Cell
b. Gene
c. Evolution
d. Homeostasis
e. Ecosystem Feedback
The correct answer is: Gene
Question 9
Correct
Question text
What process explains the unity and diversity of living organisms on our planet?
Select one:
a. taxonomy
b. metabolism
c. evolution
d. homeostasis
e. reproduction
Feedback
The correct answer is: evolution
Question 10
Correct
Question text
Which of the following is not considered a basic theory of biology?
Select one:
a. Atomic
b. Cell
c. Homeostasis
d. Ecosystem
e. Gene Feedback
The correct answer is: Atomic
Question 11
Correct
Question text
What is the term for a possible explanation for a natural event?
Select one:
a. an observation
b. a conclusion
c. a hypothesis
d. a test
e. data
Feedback
The correct answer is: a hypothesis
Question 12
Correct
Question text
To what kingdom do humans belong?
Select one:
a. Animals
b. Plants
c. Protists
d. Fungi
e. Archaea
Feedback
The correct answer is: Animals
Question 13
Correct
Question text
What kingdom is characterized by eukaryotic, multicellular organisms that ingest their food?
Select one:
a. Fungi
b. Plants
c. Protists
d. Animals
e. Archaea
Feedback
The correct answer is: Animals
Question 14
Question text
You are observing a cell through a microscope and can see that it contains no nucleus. Based exclusively on this information, to which domain(s) might this organism belong?
Select one:
a. Bacteria only
b. Archaea only
c. Eukarya only
d. Bacteria or Archaea but not Eukarya
e. Bacteria, Archaea, or Eukarya
Feedback
The correct answer is: Bacteria or Archaea but not Eukarya
Question 15
Correct
Question text
What is true of humans?
Select one:
a. they are classified as protists
b. they are descended from apes
c. they belong to the domain Archaea
d. they share a common ancestor with apes
e. they are prokaryotes
Feedback
The correct answer is: they share a common ancestor with apes
1. Week 1
2. Basic Chemistry of Cells Quiz
Question 1
Correct
Question text
What is the result of unequal sharing of electrons between two atoms?
Select one:
a. a nonpolar molecule, such as methane
b. an ionic compound, such as salt
c. an electronegative molecule, such as calcium ion
d. a hydrophobic molecule, such as fat
e. a polar molecule, such as water
Feedback
The correct answer is: a polar molecule, such as water
Question 2
Correct
Question text
What diagnostic procedure could be done in order to determine if a patient has a thyroid tumor?
Select one:
a. Patient drinks low levels of radioactive Iodine-131, then has an X-ray
b. Patient drinks high levels of radioactive Iodine-131, then has a
PET scan
c. Injection of low levels of radioactive glucose, then patient has a
PET scan
d. Injection of low levels of radioactive Thallium-201, then patient has a PET scan
e. Injection of high levels of radioactive glucose, then patient has an X-ray Feedback
The correct answer is: Patient drinks low levels of radioactive Iodine-131, then has an X-ray
Question 3
Correct
Question text
Which of the following would occur that could cause an atom to become a different element?
Select one:
a. increase the number of neutrons
b. increase the number of electrons
c. increase the number of protons
d. decrease the number of neutrons
e. decrease the number of electrons
Feedback
The correct answer is: increase the number of protons
Question 4
Correct Question text
Water molecules disassociate _ (blank) _ in salt crystals when they are dissolved in water.
Select one:
a. nonpolar covalent bonds
b. hydrogen bonds
c. polar covalent bonds
d. ionic bonds
e. hydrophobic interactions
Feedback
The correct answer is: ionic bonds
Question 5
Correct Question text
Which of the following has a positive charge?
Select one:
a. proton
b. electron
c. atomic mass
d. neutron
e. isotope
Feedback
The correct answer is: proton
Question 6 Correct Question text
What type of bond occurs between positively and negatively charged atoms?
Select one:
a. covalent bond
b. adhesive interaction
c. hydrogen bond
d. ionic bond
e. hydrophobic interaction
Feedback
The correct answer is: ionic bond
Question 7
Correct
Question text
Which factor determines whether an atom will be chemically reactive?
Select one:
a. the number of electrons in the outer shell
b. the ratio of protons to electrons
c. the number of electrons in the inner shell
d. the ratio of protons to neutrons
e. the number of electron shells an atom has
Feedback
The correct answer is: the number of electrons in the outer shell
Question 8
Correct
Question text
What are the six elements that make up living organisms?
Select one:
a. carbon, hydrogen, nitrogen, oxygen, phosphorus, sulfur
b. copper, iron, magnesium, sodium, water, zinc
c. carbon dioxide, hydrogen, nitrogen, oxygen, phosphate, sulfate
d. calcium, hydrogen, iron, potassium, sulfur, water
e. aluminum, magnesium, nitrogen, silicon, sodium, sulfur
Feedback
The correct answer is: carbon, hydrogen, nitrogen, oxygen, phosphorus, sulfur
Question 9
Correct
Question text
What type of bond occurs when electrons are equally shared between two atoms?
Select one:
a. polar
b. hydrogen
c. ionic
d. nonpolar
e. adhesive
Feedback
The correct answer is: nonpolar
Question 10 Correct
Question text
Ions located in bones and teeth that are also important in muscle contractions and nerve conduction are _ (blank) _.
Select one:
a. sodium
b. chloride
c. bicarbonate
d. potassium
e. calcium
Feedback
The correct answer is: calcium
Question 11
Correct Question text
What is the type of solution if the hydroxide ion concentration exceeds the hydrogen ion concentration?
Select one:
a. a buffer
b. an acid
c. a neutral solution
d. a base
e. a solute
Feedback
The correct answer is: a base
Question 12
Correct Question text
What is the total number of electrons in a neutral atom of phosphorus with an atomic number of 15 and a mass number of 31?
Select one:
a. 16
b. 15
c. 31
d. 8
e. 46
Feedback
The correct answer is: 15
Question 13
Correct
Question text
Which of the following is the largest number describing an atom?
Select one:
a. Electron number
b. Neutron number
c. Atomic number
d. Proton number
e. Mass number
Feedback
The correct answer is: Mass number
Question 14
Correct
Question text
How does one determine the mass number of an element?
Select one:
a. the number of neutrons plus the number of electrons
b. the number of electrons only
c. the number of protons plus the number of neutrons
d. the number of protons plus the number of electrons
e. the number of protons only
Feedback
The correct answer is: the number of protons plus the number of neutrons
Question 15
Not answered
Question text
If a sulfur atom has 6 electrons in the outermost shell, how will it likely react?
Select one:
a. gain two electrons from another atom
b. lose 6 neutrons to another atom
c. nothing, as this is a very stable atom
d. lose two electrons to another atom
e. stay as a single atom in nature
Feedback
The correct answer is: gain two electrons from another atom
1. Week 2
2. Organic Molecules and Cells Quiz
Question 1
Correct
Question text
Why are fats and oils referred to as triglycerides?
Select one:
a. They have three glycerol molecules
b. They have three fatty acid molecules
c. They have three amino acids
d. They have three phospholipids
e. They have three steroid groups
Feedback
The correct answer is: They have three fatty acid molecules
Question 2
Correct
Question text
What type of sugar is transported in plants and used as table sugar?
Select one:
a. sucrose
b. glucose
c. lactose
d. galactose
e. fructose
Feedback
The correct answer is: sucrose
Question 3
Correct
Question text
A molecule from a new organism contains adenine, cytosine, guanine, and thymine. What molecules is being looked at?
Select one:
a. DNA
b. RNA
c. lipid
d. protein
e. carbohydrate
Feedback
The correct answer is: DNA
Question 4
Incorrect
Question text
What molecule can ionize and release hydrogen ions to make the solution more acidic?
Select one:
a. carbonyl
b. phosphate
c. sulfhydryl
d. carboxyl
e. hydroxyl
Feedback
The correct answer is: carboxyl
Question 5
Incorrect
Question text
What level of protein structure is found in most enzymes and hemoglobin?
Select one:
a. dipeptide
b. primary
c. tertiary
d. quaternary
e. secondary
Feedback
The correct answer is: quaternary
Question 6
Incorrect
Question text
What type of protein structure describes a linear sequence of amino acids?
Select one:
a. quaternary
b. primary
c. pleated sheet
d. alpha helix
e. tertiary
Feedback
The correct answer is: primary
Question 7
Correct
Question text
What is the correct DNA base pair matching?
Select one:
a. T-T, C-C
b. C-C, G-G
c. A-A, T-T
d. A-U, C-G
e. A-T, C-G
Feedback
The correct answer is: A-T, C-G
Question 8
Incorrect
Question text
When added to a carbon chain which functional group will convert it into an alcohol molecule?
Select one:
a. sulfhydryl
b. hydroxyl
c. phosphate
d. carboxyl
e. carbonyl Feedback
The correct answer is: hydroxyl
Question 9
Incorrect
Question text
Which of the following is not a correct association of a lipid molecule and its specific function?
Select one:
a. beeswax: main structural component of the bee honeycomb
b. phospholipid: main component of fats and oils
c. wax: waterproof covering of plant leaves
d. testosterone: steroid involved in muscle development in males
e. cholesterol: stabilize cell membrane of animal cells
Feedback
The correct answer is: phospholipid: main component of fats and oils
Question 10
Correct
Question text
All of the following are likely to be a function of proteins in living organisms except _ (blank) _.
Select one:
a. defense
b. support
c. metabolism
d. transport
e. long term energy storage
Feedback
The correct answer is: long term energy storage
Question 11
Correct
Question text
Which of the following molecules could be used for an immediate source of energy?
Select one:
a. nucleic acids
b. carbohydrates
c. water
d. protein
e. lipids
Feedback
The correct answer is: carbohydrates
Question 12
Incorrect
Question text
What type of chemical reaction would be needed to convert a polypeptide into smaller subunits?
Select one:
a. a hydrophobic reaction
b. an isomeric reaction
c. a hydrophilic reaction
d. a hydrolysis reaction
e. a dehydration reaction
Feedback
The correct answer is: a hydrolysis reaction
Question 13
Correct
Question text
Why is sickle cell disease more common in Americans with African ancestors than Americans with European ancestors?
Select one:
a. Sickle-shaped blood cells caused malarial parasites to die, and thus gave protection against malarial infections prevalent in Africa
b. Sickle-shaped blood cells were good hosts for tuberculosis, and thus spread tuberculosis widely throughout Africa
c. Sickle-shaped blood cells caused cholera bacteria to die, and thus gave protection against large-scale cholera epidemics throughout Europe
d. Sickle-shaped blood cells caused tuberculosis bacteria to die, and thus gave protection against large-scale Tb epidemics throughout crowded areas in Africa
e. Sickle-shaped blood cells were good hosts for cholera bacteria, and thus caused many people to die from cholera and diarrhea
Feedback
The correct answer is: Sickle-shaped blood cells caused malarial parasites to die, and thus gave protection against malarial infections prevalent in Africa
Question 14
Correct
Question text
Why does the molecule shown make plaques along the walls of blood vessels?
Select one:
a. it is hydrophillic and can trap dust
b. it is hydrophobic and would not dissolve in blood fluid
c. it is hydrophobic and can repel insects
d. it is hydrophillic and likes to stick to blood fluid
e. it is hydrophobic and serves as a waterproof barrier
Feedback
The correct answer is: it is hydrophobic and would not dissolve in blood fluid
Question 15
Correct
Question text
What is the term for a large organic molecule with many subunits?
Select one:
a. hydromer
b. monomer
c. polymer
d. isomer
e. hydrophilic
Feedback
The correct answer is: polymer
1. Week 2
2. Structure and Function of Cells Quiz
Question 1
Correct Question text
Using the animal cell diagram, identify the cell structure marked "e."
Select one:
a. lysosome
b. mitochondrion
c. nucleus
d. centrioles
e. nucleolus
Feedback
The correct answer is: centrioles
Question 2
Incorrect
Question text
How is it possible to contrast chloroplasts and mitochondria?
Select one:
a. whether the organelle contains its own DNA
b. whether the organelle converts solar energy into cellular energy
c. whether the organelle is found in plant cells
d. whether the organelle has multiple membranes
e. whether the organelle has a large internal surface area
Feedback
The correct answer is: whether the organelle converts solar energy into cellular energy
Question 3
Correct
Question text
What would occur if a eukaryotic cell lacked the Golgi apparatus?
Select one:
a. it could not digest macromolecules
b. it could not package proteins
c. it could not maintain its shape
d. it would not have genetic information
e. it could not make energy
Feedback
The correct answer is: it could not package proteins
Question 4
Correct Question text
Which of the following cells would have a nucleus, a cell wall, and a large central vacuole?
Select one:
a. archaean cell
b. animal cell
c. bacterial cell
d. plant cell
e. prokaryotic cell
Feedback
The correct answer is: plant cell
Question 5
Incorrect
Question text
Where are lipids synthesized outside of the endomembrane system?
Select one:
a. smooth endoplasmic reticulum
b. rough endoplasmic reticulum
c. Golgi apparatus
d. nucleus
e. mitochondria Feedback
The correct answer is: mitochondria
Question 6 Correct
Question text
Arrange the order of cytoskeletal fibers from smallest to largest.
Select one:
a. actin filaments, microtubules, intermediate filaments
b. actin filaments, intermediate filaments, microtubules
c. microtubules, actin filaments, intermediate filaments
d. intermediate filaments, actin filaments, microtubules
e. microtubules, intermediate filaments, actin filaments
Feedback
The correct answer is: actin filaments, intermediate filaments, microtubules
Question 7
Correct
Question text
What is the basic unit of structure and function for all life?
Select one:
a. molecule
b. cell
c. organism
d. atom
e. organ
Feedback
The correct answer is: cell
Question 8
Correct
Question text
Which cell organelle is responsible for processing, packaging, and the secretion of proteins?
Select one:
a. Golgi apparatus
b. nucleus
c. lysosomes
d. smooth endoplasmic reticulum
e. rough endoplasmic reticulum
Feedback
The correct answer is: Golgi apparatus
Question 9
Correct
Question text
Using the plant cell diagram, identify the cell structure marked "a."
Select one:
a. cytoplasm
b. nucleus
c. mitochondria
d. central vacuole
e. Chloroplast
Feedback
The correct answer is: central vacuole
Question 10
Correct
Question text
Where are the majority of ribosomes found inside the cell?
Select one:
a. cytoskeleton
b. nuclear envelope
c. smooth endoplasmic reticulum
d. rough endoplasmic reticulum
e. mitochondria
Feedback
The correct answer is: rough endoplasmic reticulum
Question 11
Correct
Question text
Using the animal cell diagram, identify the cell structure marked "c."
Select one:
a. smooth endoplasmic reticulum
b. rough endoplasmic reticulum
c. Golgi apparatus
d. nucleus
e. mitochondria Feedback
The correct answer is: Golgi apparatus
Question 12
Incorrect
Question text
Select the correct pair of cytoskeletal structure and its physical makeup.
Select one:
a. centriole: short barrels of intermediate filaments
b. actin filaments: twisted strands of keratin proteins
c. microtubules: cylinders made of keratin proteins
d. flagellum: microtubule doublets and actin side arms
e. intermediate filaments: ropes made of proteins
Feedback
The correct answer is: intermediate filaments: ropes made of proteins
Question 13
Correct
Question text
Which structure can occupy up to 90% of the volume in a plant cell?
Select one:
a. central vacuole
b. endoplasmic reticulum
c. nucleus
d. chloroplasts
e. cytoplasm
Feedback
The correct answer is: central vacuole
Question 14
Correct
Question text
What structure is not typically found in a prokaryotic cell?
Select one:
a. capsule
b. nucleus
c. ribosome
d. plasma membrane
e. cell wall
Feedback
The correct answer is: nucleus
Question 15
Correct
Question text
What type of cell would have lysosomes and a nucleus, but no chloroplasts?
Select one:
a. bacterial cell
b. archaean cell
c. animal cell
d. plant cell
e. prokaryotic cell
Feedback
The correct answer is: animal cell
1. Week 2
2. Exam 1
Question 1
Incorrect
Question text
What kind of bond occurs between nucleotides in a DNA molecule, such as the polar "G" nucleotide on one strand with the polar "C" nucleotide on the other strand?
Select one:
a. hydrophobic interactions
b. hydrogen bonds
c. adhesive interactions
d. covalent bonds
e. ionic bonds
Feedback
The correct answer is: hydrogen bonds
Question 2
Correct
Question text
Which of the following is not considered a basic theory of biology?
Select one:
a. Atomic
b. Cell
c. Homeostasis
d. Ecosystem
e. Gene Feedback
The correct answer is: Atomic
Question 3
Correct
Question text
What would be the result of a cell that did not have RNA molecules?
Select one:
a. The DNA would take over its job
b. The cell would not have genes
c. There would be no effect on the cell
d. The cell could not make energy
e. The cell would not be able to make proteins
Feedback
The correct answer is: The cell would not be able to make proteins
Question 4 Correct
Question text
Which of the following is not a correct association of a lipid molecule and its specific function?
Select one:
a. beeswax: main structural component of the bee honeycomb
b. phospholipid: main component of fats and oils
c. wax: waterproof covering of plant leaves
d. testosterone: steroid involved in muscle development in males
e. cholesterol: stabilize cell membrane of animal cells
Feedback
The correct answer is: phospholipid: main component of fats and oils
Question 5
Correct
Question text
Where is the site for breakdown of engulfed bacteria, debris and macromolecules in an animal cell?
Select one:
a. peroxisomes
b. rough endoplasmic reticulum
c. lysosomes
d. mitochondria
e. smooth endoplasmic reticulum
Feedback
The correct answer is: lysosomes
Question 6
Incorrect
Question text
What level of protein structure is found in most enzymes and hemoglobin?
Select one:
a. dipeptide
b. primary
c. tertiary
d. quaternary
e. secondary
Feedback
The correct answer is: quaternary
Question 7
Correct
Question text
Which of the following molecules is more complex than a monosaccharide?
Select one:
a. sucrose
b. galactose
c. deoxyribose
d. glucose
e. ribose
Feedback
The correct answer is: sucrose
Question 8
Correct
Question text
Which of the following is true about eukaryotic cells when compared to prokaryotic cells?
Select one:
a. eukaryotic cells are smaller
b. eukaryotic cells have a capsule
c. eukaryotic cells have no cell membrane
d. eukaryotic cells have no nucleus
e. eukaryotic cells have a nucleus
Feedback
The correct answer is: eukaryotic cells have a nucleus
Question 9
Correct
Question text
What is true of carbon because it has four electrons in its outer shell?
Select one:
a. gain four electrons to complete its outer shell
b. lose four electrons to become stable
c. gain or lose two electrons to become stable
d. share four electrons to complete its outer shell
e. share two electrons to complete its outer shell
Feedback
The correct answer is: share four electrons to complete its outer shell
Question 10
Incorrect
Question text
What is the type of solution if the hydroxide ion concentration exceeds the hydrogen ion concentration?
Select one:
a. a buffer
b. an acid
c. a neutral solution
d. a base
e. a solute
Feedback
The correct answer is: a base
Question 11
Correct
Question text
Which of the following cells would have a nucleus, a cell wall, and a large central vacuole?
Select one:
a. archaean cell
b. animal cell
c. bacterial cell
d. plant cell
e. prokaryotic cell
Feedback
The correct answer is: plant cell
Question 12
Correct
Question text
If water is mixed with salt in a beaker, what does the salt represent?
Select one:
a. the solvent
b. the solute
c. the solution
d. the buffer
e. the ion
Feedback
The correct answer is: the solute
Question 13
Correct
Question text
The tendency of water molecules to cling to other water molecules is _ (blank) _.
Select one:
a. adhesion
b. electronegativity
c. polar
d. cohesion
e. nonpolar
Feedback
The correct answer is: cohesion
Question 14
Correct
Question text
Which of the following is true of ATP?
Select one:
a. It is used for long term energy storage
b. It has a base of adenine, the sugar ribose, and three phosphate groups
c. It contains adenine, ribose, and two phosphate groups
d. It has a base of adenine, the sugar deoxyribose, and three phosphate groups
e. It is very stable)
Feedback
The correct answer is: It has a base of adenine, the sugar ribose, and three phosphate groups
Question 15
Correct
Question text
What type of organism uses chitin for structure and support?
Select one:
a. bacterium
b. cactus
c. human
d. tree
e. crab
Feedback
The correct answer is: crab
Question 16
Incorrect
Question text
Why is hydrochloric acid classified as an acid?
Select one:
a. it absorbs excess hydroxide ions from the solution
b. it dissociates to release hydroxide ions
c. it dissociates to release hydrogen ions and absorbs excess hydroxide ions from the solution
d. it absorbs excess hydrogen ions from the solution
e. it dissociates to release hydrogen ions
Feedback
The correct answer is: it dissociates to release hydrogen ions and absorbs excess hydroxide ions from the solution
Question 17
Correct
Question text
Which of the following is correct about saturated fatty acids?
Select one:
a. They are made of glycerol
b. They have no double bonds between carbon atoms
c. They are made of nucleotides
d. They are composed of glucose subunit
e. They are composed of amino acid subunits)
Feedback
The correct answer is: They have no double bonds between carbon atoms
Question 18 Correct
Question text
Why does the molecule shown make plaques along the walls of blood vessels?
Select one:
a. it is hydrophillic and can trap dust
b. it is hydrophobic and would not dissolve in blood fluid
c. it is hydrophobic and can repel insects
d. it is hydrophillic and likes to stick to blood fluid
e. it is hydrophobic and serves as a waterproof barrier
Feedback
The correct answer is: it is hydrophobic and would not dissolve in blood fluid
Question 19
Correct
Question text
What is the correct term for the building blocks of proteins?
Select one:
a. monosaccharides
b. amino acids
c. phospholipids
d. peptides
e. nucleotides
Feedback
The correct answer is: amino acids
Question 20
Correct
Question text
What is the function of transport vesicles inside a cell?
Select one:
a. move proteins between the SER and the RER
b. move proteins between the endoplasmic reticulum and the Golgi apparatus
c. move proteins between the endoplasmic reticulum and the cell membrane
d. move proteins between the nucleus and the endoplasmic reticulum
e. move proteins between the nucleus and the Golgi apparatus
Feedback
The correct answer is: move proteins between the endoplasmic reticulum and the Golgi apparatus
Question 21
Correct
Question text
Using the animal cell diagram, identify the cell structure marked "a."
Select one:
a. nucleus
b. rough endoplasmic reticulum
c. mitochondria
d. Golgi apparatus
e. smooth endoplasmic reticulum
Feedback
The correct answer is: rough endoplasmic reticulum
Question 22
Correct
Question text
Where are saturated fats primarily found?
Select one:
a. fungi
b. crustaceans
c. bacterial cell walls
d. plant oils
e. mammals
Feedback
The correct answer is: mammals
Question 23
Correct
Question text
What type of reaction removes a hydroxyl group and a hydrogen atom from two molecules to join them together?
Select one:
a. a dehydration reaction
b. a hydrophilic reaction
c. a monomer reaction
d. a polymer reaction
e. a hydrolysis reaction
Feedback
The correct answer is: a dehydration reaction
Question 24
Correct
Question text
The cytoskeleton performs all of these functions except _ (blank) _.
Select one:
a. help white blood cells break down bacteria that have been engulfed
b. strengthen a layer of skin cells
c. help connective cells crawl along a surface
d. help organelles move inside a cell
e. maintain the shape of intestinal cells
Feedback
The correct answer is: help white blood cells break down bacteria that have been engulfed
Question 25
Correct
Question text
What molecule can ionize and release hydrogen ions to make the solution more acidic?
Select one:
a. carbonyl
b. phosphate
c. sulfhydryl
d. carboxyl
e. hydroxyl
Feedback
The correct answer is: carboxyl
Question 26
Correct
Question text
What is the basic unit of structure and function for all life?
Select one:
a. molecule
b. cell
c. organism
d. atom
e. organ
Feedback
The correct answer is: cell
Question 27
Correct
Question text
What kind of interaction occurs between atoms of sodium and chlorine?
Select one:
a. The sodium atom gives up one proton
b. The sodium atom gives up one neutron
c. The chlorine atom gives up one neutron
d. The chlorine atom gives up one electron
e. The sodium atom gives up one electron
Feedback
The correct answer is: The sodium atom gives up one electron
Question 28
Correct
Question text
What type of chemical reaction would be needed to convert a polypeptide into smaller subunits?
Select one:
a. a hydrophobic reaction
b. an isomeric reaction
c. a hydrophilic reaction
d. a hydrolysis reaction
e. a dehydration reaction
Feedback
The correct answer is: a hydrolysis reaction
Question 29
Correct Question text
If a sulfur atom has 6 electrons in the outermost shell, how will it likely react?
Select one:
a. gain two electrons from another atom
b. lose 6 neutrons to another atom
c. nothing, as this is a very stable atom
d. lose two electrons to another atom
e. stay as a single atom in nature
Feedback
The correct answer is: gain two electrons from another atom
Question 30
Correct
Question text
(blank) _ occurs when protein structure changes due to high heat.
Select one:
a. Denaturation
b. Saturation
c. Synthesis
d. Dehydration
e. Hydrolysis
Feedback
The correct answer is: Denaturation
Question 31
Correct
Question text
What is the benefit of low levels of radioactive isotopes in a medicinal setting?
Select one:
a. as tracers in imaging organs using Xrays and PET Scans
b. to reduce obesity and diabetes in teenagers
c. to create drugs that work faster than normal
d. to destroy aging and unwanted cells
e. to prevent ultraviolet damage from the sun
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The correct answer is: as tracers in imaging organs using Xrays and PET Scans
Question 32
Correct Question text
The type of bond between one hydrogen atom and one oxygen atom in a water molecule is _ (blank) _.
Select one:
a. a polar covalent bond
b. an ionic bond
c. hydrogen bond
d. a nonpolar covalent bond
e. a hydrophobic interaction
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The correct answer is: a polar covalent bond
Question 33
Correct
Question text
What is the term for a specific combination of bonded atoms which always react in the same way?
Select one:
a. a hydrophilic group
b. a hydrophobic group
c. an organic group
d. a functional group
e. a covalent group
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The correct answer is: a functional group
Question 34
Incorrect
Question text
_ (blank) _ is an atom with an unequal number of protons and electrons.
Select one:
a. An isotope
b. An ion
c. A compound
d. An octet
e. A valance
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The correct answer is: An ion
Question 35
Correct
Question text
Which organelle acts as the powerhouse of the cell?
Select one:
a. mitochondria
b. nucleus
c. rough endoplasmic reticulum
d. chloroplast
e. lysosome
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The correct answer is: mitochondria
Question 36
Correct
Question text
An example of _ (blank) _ is flat leaves in plants that are able to provide more surface area for light exposure.
Select one:
a. an adaptation
b. homeostasis
c. a mutation
d. a gene
e. a cell
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The correct answer is: an adaptation
Question 37
Correct
Question text
What is the basic unit of structure and function for all life?
Select one:
a. atom
b. molecule
c. cell
d. organ
e. organism
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The correct answer is: cell
Question 38
Correct
Question text
When you mix sugar into Kool-Aid, the sugar dissolves in the liquid. This shows that sugar molecules are _ (blank) _.
Select one:
a. hydrophilic
b. cohesive
c. covalent
d. neither hydrophobic nor hydrophilic
e. hydrophobic
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The correct answer is: hydrophilic
Question 39
Correct
Question text
Which of these functional groups would be related to nucleotides and phospholipids?
Select one:
a. hydroxyl
b. phosphate
c. sulfhydryl
d. carbonyl
e. carboxyl
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The correct answer is: phosphate
Question 40
Correct
Question text
Each of the following is a use of water by living organisms except _ (blank) _.
Select one:
a. external transportation for chemicals
b. help exchange heat
c. aids in homeostasis
d. provides nutrients for metabolism
e. provides a medium for movement
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The correct answer is: provides nutrients for metabolism
