Question 1

Which of the following best describes the lag phase in bacterial growth?

Accepted Answer

Cells are adapting to new environmental conditions and preparing for division.

Question 2

During transcription in bacteria, which enzyme is responsible for synthesizing RNA from a DNA template?

Accepted Answer

RNA polymerase

Question 3

Which mutation type involves the replacement of one nucleotide with another, potentially resulting in a single amino acid change?

Accepted Answer

Point mutation

Question 4

A bacterial cell is exposed to UV light, causing thymine dimers. Which DNA repair mechanism is most likely to fix this damage?

Accepted Answer

Excision repair

Question 5

Which of the following best describes horizontal gene transfer via conjugation?

Accepted Answer

Direct transfer of DNA between two bacteria through a pilus

Question 6

Which viral genome type is most likely to require reverse transcriptase for replication?

Accepted Answer

ssRNA (retrovirus)

Question 7

A bacteriophage infects a bacterium and integrates its genome into the host chromosome. What is this process called?

Accepted Answer

Lysogeny

Question 8

Which of the following equations correctly represents exponential bacterial growth?

Accepted Answer

$$N_t = N_0$ 	imes 2^n$$

Question 9

Which repair mechanism involves the removal of damaged DNA followed by synthesis of new DNA using the undamaged strand as a template?

Accepted Answer

Excision repair

Question 10

Transposons are best described as:

Accepted Answer

Mobile genetic elements that can move within and between genomes

Question 11

Which of the following is a real-world consequence of horizontal gene transfer in bacteria?

Accepted Answer

Spread of antibiotic resistance genes among pathogenic bacteria

Question 12

Which step in the viral replication cycle involves the virus attaching to specific receptors on the host cell surface?

Accepted Answer

Attachment

Question 13

A patient is infected with a virus that has a segmented RNA genome. Which virus is most likely responsible?

Accepted Answer

Influenza virus

Question 14

Which of the following best describes the process of bacterial transformation?

Accepted Answer

Uptake of naked DNA from the environment by a bacterium

Question 15

Which enzyme is required for the integration of transposons into a new location in the genome?

Accepted Answer

Transposase

Question 16

Which of the following is a characteristic of the stationary phase in bacterial growth?

Accepted Answer

Nutrient depletion and accumulation of waste products limit cell division.

Question 17

Which of the following is NOT a mechanism of horizontal gene transfer in bacteria?

Accepted Answer

Transposition

Question 18

Which of the following viruses is classified as a retrovirus?

Accepted Answer

HIV

Question 19

Which step in the bacteriophage lytic cycle results in the destruction of the host cell?

Accepted Answer

Release

Question 20

Which of the following best explains why recombinational repair is important for bacterial survival?

Accepted Answer

It allows bacteria to repair double-stranded DNA breaks using homologous recombination.

Microbial Genetics, Viral Classification, and Replication Study Guide

Study Guide - Practice Questions