1. Why would a bacterial culture not continue to double after a while?
a. The culture needs more light.
b. The culture only reproduces for 5 generations.
c. The culture has switched to a different type of reproduction.
d. The culture needs more enzymes to continue.
e. The culture can only double for a given number of generations until the nutrients are depleted and wastes are produced. ***
2. Once biofilms become sessile, they are which of the following?
a. Not able to divide
b. Attached ***
c. Motile
d. Easily washed off
e. Washed off
3. Which of the following would indicate the most significant number of bacteria in a solution?
a. 0% of the light would pass through.
b. 10% of the light would pass through.
c. 50% of the light would pass through.
d. All light would pass through. ***
e. 20% of the light would pass through.
4. Which of the following needs to occur before a cell can divide?
a. DNA replication ***
b. Cytokinesis
c. Formation of a septum
d. Formation of Z ring
e. Formation of cleavage furrow
5. Which bacterial species needs oxygen?
a. Obligate anaerobe
b. Obligate aerobe ***
c. Microaerophile
d. Aerotolerant anaerobe
e. Facultative anaerobe
6. Given a colony of bacteria is growing in optimal conditions, which of the following would have the largest population in 24 hours?
a. Either Mycobacterium leprae or Mycobacterium tuberculosis
b. Either Escherichia coli or Mycobacterium tuberculosis
c. Escherichia coli ***
d. Mycobacterium leprae
e. Mycobacterium tuberculosis
7. Prokaryotic cells replicate by which of the following?
a. Schizogony
b. Mitosis
c. Meiosis
d. Binary fission ***
c. Conjugation