Bacterial growth 2

Previous exams & Formative:

1- Bacterial chromosome is composed of: a. Double stranded DNA b. Single stranded DNA c. Double stranded RNA d. Single stranded RNA

2- All genetic material of bacteria is composed of; a. Single linear bacterial chromosome only b. Single circular bacterial chromosome only c. Single circular bacterial chromosome and extra-chromosomal elements d. Plasmid and phages only

3- Bacteria which need oxygen for growth are called: a. Thermophilic bacteria b. Anaerobic bacteria c. Facultative anaerobic bacteria d. Mycobacteria

4- PH required for the growth of bacteria is: a. 6.8-7.2 b. 5.6-8.2 c. 3.0-6.0 d. 8.0-14.0

5- The orderly increase in the quantity of all cellular components is known as: a. Reproduction b. Growth c. Binary fission d. None of the above

6- Optimum growth temperature is greater than 45C is: a. Mesophiles b. Thermophiles c. Psychrophiles d. None of these

7- The organism that can grow both in presence and absence of oxygen: a. Aerobes b. Anaerobes c. Facultative anaerobes d. Strict aerobes

8- The organism that can grow best in a low concentration of oxygen: a. Aerophilic b. Microaerophilic c. Aerobic d. Anaerobic

9- Tubercular bacilli grow best in: a. Absence of oxygen b. Presence of Co2 c. Presence of O2 d. None of these

10- Bacteria are more sensitive to antibiotic at which phase of growth curve: a. Decline of phase b. Stationary phase c. Lag phase d. Log phase

11- An organism that lack superoxide dismutase and catalase to remove toxic superoxide are: a. Obligate anaerobes b. Obligate aerobes c. Facultative anaerobes d. Microaerophilic

12- In bacterial growth curve, maximum growth occurs during: a. Decline phase b. Stationary phase c. Lag phase d. Log phase

13- During the bacterial growth, death rate exceeds the multiplication rate in: a. The lag phase b. The log phase c. The stationary phase d. The decline phase

Extra:

1- The group of bacteria which depends on organic sources in nature for their energy requirement are said to be: a. Phototrophs b. Autotrophs c. Chemotrophs d. Heterophils

2- The lag phase of bacterial growth curve correlates in vivo with which of the following: a. Symptoms and signs of disease b. Incubation period c. Invasive period d. Convalescence

3- Only one of the following is true about the bacterial growth curve: a. Can be obtained by growing bacteria on solid media. b. Decline phase is absent in some bacteria. c. Lag phase is equal in all bacteria. d. Logarithmic phase correlate with convalescent phase of disease. e. Stationary phase accompanied by bacterial death.

4- The rate of the bacterial growth during the stationary phase is: a. Zero b. Constant c. Increasing d. Decreasing