Biochemistry Question Bank
Course Introduction
Biochemistry is the study of the chemical processes and substances that occur within living organisms. This course explores the molecular foundations of life by examining the structures and functions of biomolecules such as proteins, lipids, carbohydrates, and nucleic acids. Students will learn about enzyme mechanisms, metabolic pathways, and the regulation of cellular activities. Through lectures and laboratory work, the course emphasizes the integration of chemical principles with biological systems, providing a comprehensive understanding of how molecular interactions drive the complexity of biological functions and processes.
Recommended Textbook
Chemistry An Introduction to General Organic and Biological Chemistry 12th Edition by Karen C.
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18 Chapters
1623 Verified Questions
1623 Flashcards
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Page 2
Chapter 1: Chemistry in Our Lives
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Sample Questions
Q1) The product of (-4)× (-5)is ________.
A)-20
B)+20
C)-1
D)+1
E)0
Answer: B
Q2) In the number 123.45,the digit 5 is in the hundreds place.
A)True
B)False
Answer: False
Q3) The first step in the scientific method is to draw a conclusion.
A)True
B)False
Answer: False
Q4) The substances released when tissues are injured are ________.
Answer: prostaglandins
Q5) The first step in the scientific method is to________. Answer: make observations
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Chapter 2: Chemistry and Measurement
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Sample Questions
Q1) Which one of the following substances will float in gasoline,which has a density of 0.74 g/mL? The density of each substance is shown in parentheses.
A)table salt (D = 2.16 g/mL)
B)balsa wood (D = 0.16 g/mL)
C)sugar (D = 1.59 g/mL)
D)aluminum (D = 2.70 g/mL)
E)mercury (D = 13.6 g/mL)
Answer: B
Q2) The ratio of the mass of a substance to its volume is its ________.
A)specific gravity
B)density
C)buoyancy
D)weight
E)conversion factor
Answer: B
Q3) 0.003 4088
Answer: 0.00341
Q4) 0.008090 cm
Answer: 4
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Chapter 3: Matter and Energy
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Sample Questions
Q1) Raising the temperature of 10.0 g of water from 10.0 °C to 20.0 °C requires 100.0 cal of energy,while raising the temperature of 10.0 g of aluminum from 10.0 °C to 20.0 °C requires 22.0 cal.More calories are required to heat the water because ________.
A)water is a liquid and aluminum is a solid at 10.0 °C
B)ten grams of water occupies a larger volume than 10.0 g of aluminum
C)water has a greater potential energy than aluminum
D)water has a larger specific heat than aluminum
E)10.0 °C is closer to the melting point of water than to the melting point of aluminum
Answer: D
Q2) A temperature of 50.°F is equivalent to ________°C. Answer: 10 °C
Q3) A kilocalorie of heat is required to raise the temperature of ________.
A)1 g of water from 14 °C to 15 °C
B)1 g of water by 10 °C
C)10 g of water by 10 °C
D)100 g of water by 10 °C
E)100 g of water by 100 °C
Answer: D
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Chapter 4: Atoms and Elements
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Sample Questions
Q1) Sulfur
Q2) The number of electron energy levels in a magnesium atom is ________.
A)1
B)2
C)3
D)4
E)5
Q3) Which of the following elements is a metal?
A)nitrogen
B)fluorine
C)argon
D)strontium
E)phosphorus
Q4) What is the electron arrangement for aluminum?
A)2,8,3
B)2,8,5
C)2,8,7
D)2,8,8
E)2,8,10
Q5) Phosphorus
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Chapter 5: Nuclear Chemistry
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Sample Questions
Q1) In the sun,nuclei of hydrogen combine to form a larger nucleus and release a great amount of energy.The process is known as ________.
A)fission
B)fusion
C)metathesis
D)chain reaction
E)ionization
Q2) Gamma rays require the heaviest shielding of all the common types of nuclear radiation because gamma rays have the ________.
A)highest energy
B)most intense color
C)lowest energy
D)largest particles
E)heaviest particles
Q3) If the half-life of hydrogen-3 is 11.8 yr,after two half-lives the radioactivity of a sample will be reduced to one-half of the original amount.
A)True
B)False
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Chapter 6: Ionic and Molecular Compounds
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Sample Questions
Q1) A positive ion has more protons that electrons.
A)True
B)False
Q2) The ammonia molecule (NH<sub>3</sub>)is ________.
A)a polar molecule with polar bonds
B)a nonpolar molecule with polar bonds
C)a nonpolar molecule with nonpolar bonds
D)a polar molecule with nonpolar bonds
E)a polar molecule with ionic bonds
Q3) In ionic compounds,________ lose their valence electrons to form positively charged ________.
A)metals,anions
B)nonmetals,cations
C)metals,polyatomic ions
D)nonmetals,anions
E)metals,cations
Q4) A potassium atom gains electrons to form an ion with a charge of 1-.
A)True
B)False
Q5) sodium fluoride
8
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Chapter 7: Chemical Quantities and Reactions
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Sample Questions
Q1) How many moles of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>)are needed to produce 5.0 moles of water?
A)1.0 mole
B)2.0 moles
C)2.5 moles
D)4.0 moles
E)5.0 moles
Q2) In the reaction of hydrogen gas with oxygen gas to produce water,1 mole of oxygen gas can produce 2 moles of water,given sufficient hydrogen available.
A)True
B)False
Q3) In a ________ reaction,two or more elements or compounds form one product.
A)decomposition
B)single replacement
C)combustion
D)double replacement
E)combination
Q4) The number of particles in 1 mole of hydrogen gas is ________.
Q5) What is the mass,in grams,of 1.00 mole of argon gas?
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Chapter 8: Gases
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Sample Questions
Q1) Nitrogen makes up about ________ percent of the atmosphere.
Q2) According to the kinetic theory of gases,particles of a gas ________.
A)are very large particles
B)are very far apart
C)lose their valence electrons
D)move slowly
E)decrease kinetic energy as temperature increases
Q3) The volume of a gas with a pressure of 1.2 atm increases from 1.0 L to 4.0 L.What is the final pressure of the gas,assuming constant temperature?
A)1.2 atm
B)0.30 atm
C)3.3 atm
D)4.8 atm
E)1.0 atm
Q4) At 0 K,all molecular motion stops.
A)True
B)False
Q5) During inspiration,we use 100% of the oxygen in the air we breathe.
A)True
B)False
10
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Chapter 9: Solutions
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Sample Questions
Q1) Which starch solution will decrease in volume as osmosis occurs?
A)4%
B)10%
C)Neither exerts osmotic pressure.
D)They exert equal osmotic pressures.
E)They exert opposite osmotic pressures.
Q2) A 10% starch solution is separated from a 2% starch solution by a semipermeable membrane.Starch is a colloid.Which of the following is correct?
A)The 10% solution has the higher osmotic pressure.
B)The 2% solution has the higher osmotic pressure.
C)Neither solution has osmotic pressure.
D)The solutions have the same osmotic pressure.
E)The solutions have opposite osmotic pressures.
Q3) When 50.mL of 10.% (m/v)NaCl is diluted to 500.mL,the NaCl concentration is _____%.
Q4) If a red blood cell is placed in 1% glucose solution,the red blood cell will________.
Q5) A substance that completely ionizes in water is a ________ electrolyte.
Q6) When KCl is added to water,the salt will be ________.
Q7) A 2.0% (m/v)NaCl solution contains ________ g NaCl in 300.mL of solution.
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Chapter 10: Acids and Bases and Equilibrium
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Sample Questions
Q1) What is the name of the medical condition of an asthmatic patient with a blood pH of 7.30?
A)respiratory acidosis
B)respiratory alkalosis
C)metabolic acidosis
D)metabolic alkalosis
E)diabetes mellitus
Q2) A buffer is a solution that tends to maintain a neutral pH.
A)True
B)False
Q3) Which one of the following is characteristic of a base?
A)produces H<sub>3</sub>O<sup>+</sup> in water
B)has a sour taste
C)has a slippery,soapy feel
D)turns blue litmus red
E)is insoluble in water
Q4) If the carbon dioxide level in the blood is too high,more carbonic acid is produced,and this results in the condition termed acidosis.
A)True
B)False
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Chapter 11: Introduction to Organic Chemistry: Hydrocarbons
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Sample Questions
Q1) In a trans alkene,the groups are on the same side of the double bond.
A)True
B)False
Q2) What is the name for a three-carbon saturated alkyl group?
A)methyl
B)ethyl
C)propyl
D)butyl
E)pentyl
Q3) The IUPAC name for CH3-CH2 -C C-CH<sub>3</sub> is ________.
A)3-pentyne
B)2-pentyne
C)pentyne
D)1-methylbutyne
E)2-propene
Q4) Organic compounds are always highly water soluble.
A)True
B)False
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Chapter 12: Alcohols, Thiols, Ethers, Aldehydes, and Ketones
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Sample Questions
Q1) What kind of attractive forces do alcohols form between individual molecules?
A)oxygen bonds
B)hydrogen bonds
C)single bonds
D)carbon bonds
E)ionic bonds
Q2) Acetone is a three-carbon aldehyde.
A)True
B)False
Q3) In the IUPAC naming system,a ketone is named by replacing the -e in the corresponding alkane name with ________.
A)yne
B)ene
C)al
D)one
E)ol
Q4) Phenol was formerly used as an antiseptic.
A)True
B)False
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Chapter 13: Carbohydrates
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Sample Questions
Q1) Fructose does not undergo hydrolysis because it is a ________.
A)aldose
B)hexose
C)reducing sugar
D)monosaccharide
E)disaccharide
Q2) Which of the following objects is chiral? Assume that each object has no markings or printing.
A)an pencil
B)a baseball bat
C)a glove
D)a hockey puck
E)a drinking glass
Q3) Hyperglycemia is a condition in which ________.
A)the glucose level in the blood is about 100 mg/dL
B)the amount of glucose in the urine is lower than normal
C)the glucose level in the blood is higher than normal
D)the glucose level in the pancreas is lower than normal
E)the glucose level in the liver is lower than normal
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Chapter 14: Carboxylic Acids, Esters, Amines, and Amides
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Sample Questions
Q1) In water solution,how does dilute acetic acid behave?
A)as a strong acid
B)as a weak acid
C)as a strong base
D)as a weak base
E)as a neutral compound
Q2) In what kind of amine is the nitrogen atom bonded to two carbon atoms?
A)primary
B)secondary
C)tertiary
D)quaternary
E)amide
Q3) Amines can form ________ bonds with water molecules.
A)oxygen
B)hydrogen
C)nonpolar
D)metallic
E)triple
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Chapter 15: Lipids
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Sample Questions
Q1) Lipids are compounds that are soluble in ________.
A)distilled water
B)normal saline solution
C)glucose solution
D)chloroform
E)oxygen
Q2) In this diagram of a cell membrane,the small branched object labeled (A)is part of a ________.
A)steroid
B)hydrophobic region
C)membrane protein
D)glycerophospholipid
E)carbohydrate side chain
Q3) A wax is composed of glycerol and three fatty acids.
A)True
B)False
Q4) Oleic acid is a saturated fatty acid.
A)True
B)False
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Chapter 16: Amino Acids, Proteins, and Enzymes
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Sample Questions
Q1) A biological catalyst is called a(n)________.
A)lipid
B)enzyme
C)steroid
D)coenzyme
E)substrate
Q2) Enkephalins are polypeptides that have ________.
A)a sweet taste
B)a bitter taste
C)extra caloric value
D)pain-killing properties
E)hormone activity
Q3) The fibrous protein responsible for the structure of hair and wool is ________.
A)keratin
B)collagen
C)endorphin
D)myosin
E)casein
Q4) The protein that transports oxygen in the blood is ________.
Q5) The molecules to which an enzyme binds are called the ________.
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Chapter 17: Nucleic Acids and Protein Synthesis
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Sample Questions
Q1) Adenine is a purine.
A)True
B)False
Q2) The result of a defective enzyme caused by a mutation in the DNA nucleotide sequence is ________.
A)a genetic disease
B)AIDS
C)HIV
D)recombinant DNA
E)translocation
Q3) The two new DNA molecules formed in replication ________.
A)are different from the original DNA
B)both contain only two new daughter DNA strands
C)both contain only the parent DNA strands
D)contain one parent and one daughter strand
E)are identical,with one containing both parent strands,and the other containing both daughter strands
Q4) In the DNA double helix,a purine can only pair with a pyrimidine.
A)True
B)False
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Chapter 18: Metabolic Pathways and Energy Production
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Sample Questions
Q1) When oxygen is in plentiful supply in the cell,pyruvate is converted to ________.
A)CoA
B)acetyl-CoA
C)glucose
D)lactate
E)fructose
Q2) Reaction 5 of the citric acid cycle is the hydrolysis of succinyl-CoA.In this reaction,________.
A)the energy released is used to make GTP
B)the energy released is used to make ATP
C)carbon dioxide is released
D) -ketoglutarate is released
E)the enzyme aconitase is needed
Q3) The cytosol is an aqueous solution of salts and enzymes.
A)True
B)False
Q4) Carbohydrate digestion begins in the mouth.
A)True
B)False
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