Question 1

Which of the following best describes the process of binary fission in bacteria?

Accepted Answer

It is a process where a bacterial cell divides into two identical daughter cells by duplicating its DNA and splitting the cytoplasm.

Question 2

During the bacterial growth curve, which phase is characterized by rapid cell division and exponential increase in population size?

Accepted Answer

Log (exponential) phase

Question 3

A biofilm protects bacteria primarily by:

Accepted Answer

Creating a matrix of polysaccharides and proteins that shields bacteria from environmental threats and antibiotics.

Question 4

Which two genera are most commonly associated with endospore formation, and what is the primary function of endospores?

Accepted Answer

Bacillus and Clostridium; endospores allow bacteria to survive extreme conditions.

Question 5

Which type of bacteria would thrive at temperatures above $$80^\circC$$?

Accepted Answer

Hyperthermophiles

Question 6

A microbiologist is culturing bacteria that require oxygen but are harmed by high concentrations of it. Which term best describes these bacteria?

Accepted Answer

Microaerophiles

Question 7

Which of the following media types would you use to distinguish between two bacterial species based on their ability to ferment lactose?

Accepted Answer

Differential media

Question 8

A pure culture is best obtained using which technique, and why?

Accepted Answer

Streak-plate method, because it separates individual cells to form isolated colonies.

Question 9

Which method is most appropriate for counting only live bacteria in a sample?

Accepted Answer

Standard plate count

Question 10

Which of the following statements about enzymes is FALSE?

Accepted Answer

Enzymes are consumed during the reaction.

Question 11

ATP is produced during cellular respiration by phosphorylation. Which equation best represents the phosphorylation of ADP to ATP?

Accepted Answer

$$\mathrm{ADP} + \mathrm{P_i} \rightarrow \mathrm{ATP}$$

Question 12

In aerobic respiration, what is the final electron acceptor?

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 13

Which process involves the removal of an amino group from a protein during catabolism?

Accepted Answer

Deamination

Question 14

Which of the following best describes the central dogma of biology?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein.

Question 15

Which of the following is NOT a difference between DNA and RNA?

Accepted Answer

DNA is found only in the nucleus, while RNA is found only in the cytoplasm.

Question 16

Which of the following best describes a plasmid?

Accepted Answer

A small, circular piece of DNA found in bacteria that can carry genes for antibiotic resistance.

Question 17

Which process is used by bacteria to transfer genetic material via a pilus?

Accepted Answer

Conjugation

Question 18

A mutation caused by exposure to UV light is an example of which type of mutation?

Accepted Answer

Physical mutation

Question 19

Which test is commonly used to identify mutagenic substances?

Accepted Answer

Ames test

Question 20

Which of the following best describes chemiosmosis during oxidative phosphorylation?

Accepted Answer

The movement of protons ($$\mathrm{H^+}) $$across a membrane creates a gradient that drives ATP synthesis via ATP synthase.

Microbiology Study Guide: Microbial Growth, Metabolism, and Genetics

Study Guide - Practice Questions