Question 1

Which of the following best describes the difference between catabolism and anabolism in cellular metabolism?

Accepted Answer

Catabolism breaks down complex molecules to release energy, while anabolism builds complex molecules from simpler ones using energy.

Question 2

During cellular respiration, which molecule acts as the final electron acceptor in aerobic respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 3

Which of the following is the correct order of steps in glycolysis?

Accepted Answer

Glucose phosphorylation, cleavage of 6-carbon sugar, energy harvest

Question 4

Which of the following statements about FAD and NAD$$^+ is $$correct?

Accepted Answer

Both FAD and NAD$$^+$$ are reduced during catabolic reactions to form FADH$$_2$$ and NADH, respectively.

Question 5

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site and preventing substrate binding.

Question 6

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

ATP is produced directly by transferring a phosphate group from a substrate to ADP.

Question 7

Which type of microorganism would thrive in an environment with a pH of 2?

Accepted Answer

Acidophile

Question 8

During binary fission, which event occurs first?

Accepted Answer

DNA replication

Question 9

Which of the following is NOT a phase of the microbial growth curve?

Accepted Answer

Reduction phase

Question 10

Which of the following equations correctly represents the calculation of generation time ($$g) in a $$bacterial culture?

Accepted Answer

$$g = \frac{t}{n}$$, where $$t is $$time and $$n is $$number of generations

Question 11

Which of the following statements about plasmids is TRUE?

Accepted Answer

Plasmids are circular DNA molecules that can carry antibiotic resistance genes.

Question 12

Which process is responsible for the transfer of genetic material between bacteria via direct cell-to-cell contact?

Accepted Answer

Conjugation

Question 13

Which of the following best describes the role of tRNA in translation?

Accepted Answer

tRNA carries amino acids to the ribosome and matches them to the mRNA codon.

Question 14

Which mutation is most likely to result in a nonfunctional protein?

Accepted Answer

Nonsense mutation

Question 15

Which of the following is a characteristic of quorum sensing in bacteria?

Accepted Answer

It allows bacteria to sense and respond to population density by producing signaling molecules.

Question 16

Which enzyme is responsible for synthesizing new DNA strands during replication?

Accepted Answer

DNA polymerase

Question 17

Which of the following best describes the difference between symbiotic and non-symbiotic relationships?

Accepted Answer

Symbiotic relationships involve close physical association between organisms, while non-symbiotic relationships do not.

Question 18

Which of the following best explains the effect of temperature on enzyme activity?

Accepted Answer

Enzyme activity is highest at the optimum temperature and decreases at temperatures above or below this point.

Question 19

Which of the following is the correct complementary base pairing in DNA?

Accepted Answer

Adenine pairs with thymine, guanine pairs with cytosine

Microbiology Study Guide: Metabolism, Enzymes, Catabolism, Growth, Genetics, and Cell Relationships

Study Guide - Practice Questions