$$\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$$

Question 1

Which of the following best defines a genome?

Accepted Answer

The total genetic material of an organism, including all chromosomes and plasmids

Question 2

During DNA replication, which enzyme is responsible for synthesizing the new DNA strand by adding nucleotides?

Accepted Answer

DNA polymerase

Question 3

A mutation changes the DNA sequence from $$	ext{ATG} to$$ $$	ext{ATA}. $$What type of mutation is this?

Accepted Answer

Missense mutation

Question 4

Which of the following statements about the genetic code is correct?

Accepted Answer

The genetic code is universal among all living organisms

Question 5

In the Ames test, what is the primary purpose of using a strain of bacteria that cannot synthesize histidine?

Accepted Answer

To detect the presence of mutagens by observing the reversion to histidine synthesis

Question 6

Which of the following best describes horizontal gene transfer in bacteria?

Accepted Answer

Transfer of genetic material between unrelated cells

Question 7

Which process occurs in both prokaryotes and eukaryotes but differs in the presence of introns and RNA processing?

Accepted Answer

Transcription

Question 8

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

Accepted Answer

Nucleotide excision repair

Question 9

Which of the following is a function of plasmids in bacteria?

Accepted Answer

Providing antibiotic resistance genes

Question 10

Which equation best represents the central dogma of molecular biology?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 11

Which of the following best describes an operon?

Accepted Answer

A group of genes regulated by a single promoter and operator

Question 12

Which method is used for indirect selection of mutations in bacteria?

Accepted Answer

Replica plating

Question 13

Which of the following is a consequence of a nonsense mutation?

Accepted Answer

Premature termination of protein synthesis

Question 14

Which of the following statements about genetic recombination in bacteria is correct?

Accepted Answer

It can occur via transformation, transduction, or conjugation

Question 15

A scientist wants to increase the mutation rate in a bacterial culture. Which of the following would be most effective?

Accepted Answer

Adding a known mutagen such as ethidium bromide

Question 16

Which of the following best describes the difference between genotype and phenotype?

Accepted Answer

Genotype is the genetic makeup; phenotype is the observable characteristics

Question 17

Which of the following is a real-world example of horizontal gene transfer contributing to natural selection?

Accepted Answer

Spread of antibiotic resistance genes among bacterial populations

Question 18

Which of the following is a multi-step process that includes transcription, RNA processing, and translation?

Accepted Answer

Protein synthesis in eukaryotes

Question 19

Transposons are best described as:

Accepted Answer

Segments of DNA that can move from one location to another within the genome

Question 20

Which of the following is an example of pre-transcriptional regulation of gene expression?

Accepted Answer

Methylation of DNA to inhibit transcription

Microbial Genetics: Key Concepts and Mechanisms

Study Guide - Practice Questions