Question 1

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP is a high-energy molecule that temporarily stores and transfers energy for cellular processes.

Question 2

During glycolysis, what is the net gain of ATP molecules per molecule of glucose?

Accepted Answer

$$2$$

Question 3

Which of the following statements about the electron transport chain (ETC) in bacteria is correct?

Accepted Answer

The ETC generates a proton motive force by pumping protons across the plasma membrane.

Question 4

Which of the following best explains why ATP is considered a 'high-energy' molecule?

Accepted Answer

ATP has three phosphate groups linked by phosphoanhydride bonds, which release significant free energy upon hydrolysis.

Question 5

A bacterium is found to use light as its energy source and carbon dioxide as its carbon source. Which metabolic class does it belong to?

Accepted Answer

Photoautotroph

Question 6

Which of the following is TRUE regarding the flow of genetic information in the central dogma of molecular biology?

Accepted Answer

Information flows from DNA to RNA to protein.

Question 7

During DNA replication in bacteria, which enzyme is responsible for relieving supercoiling ahead of the replication fork?

Accepted Answer

DNA gyrase

Question 8

Which of the following best describes the process of transformation in horizontal gene transfer?

Accepted Answer

Uptake of free DNA from the environment by a bacterial cell.

Question 9

Which of the following statements about the lagging strand during DNA replication is correct?

Accepted Answer

It is synthesized discontinuously as Okazaki fragments.

Question 10

Which of the following best explains why NAD+ is considered an electron carrier in cellular metabolism?

Accepted Answer

NAD+ accepts electrons and becomes reduced to NADH during metabolic reactions.

Question 11

A mutation in a bacterial gene results in the inability to synthesize the sigma factor. Which process would be directly affected?

Accepted Answer

Transcription initiation

Question 12

Which of the following is a correct statement about the genetic code?

Accepted Answer

There are 64 possible codons, including start and stop codons.

Question 13

Which of the following best describes the function of tRNA during translation?

Accepted Answer

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

Question 14

Which of the following statements about the Polymerase Chain Reaction (PCR) is correct?

Accepted Answer

PCR amplifies specific DNA sequences using cycles of denaturation, annealing, and extension.

Question 15

In the context of redox reactions in metabolism, which statement is correct?

Accepted Answer

The electron acceptor always has a higher reduction potential than the donor.

Question 16

Which of the following is a function of bacterial plasmids?

Accepted Answer

They often carry genes that confer advantageous traits, such as antibiotic resistance.

Question 17

A bacterium is able to grow using nitrate ($$NO_3$$^-$$) as a terminal electron acceptor in the absence of oxygen. This process is best described as:

Accepted Answer

Anaerobic respiration

Question 18

Which of the following statements about the Calvin cycle is correct?

Accepted Answer

The Calvin cycle incorporates $$CO_2$$ into organic molecules during carbon fixation.

Question 19

Which of the following best describes the function of bacterial conjugation?

Accepted Answer

Direct transfer of DNA from one bacterium to another through a pilus.

Question 20

Which of the following is a key difference between prokaryotic and eukaryotic DNA?

Accepted Answer

Prokaryotic DNA is circular and lacks nucleosomes.

Microbiology Exam 1 Study Guide: Metabolism, Genetics, and Gene Transfer

Study Guide - Practice Questions