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

Question 1

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

Accepted Answer

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

Question 2

A mutation that results in the insertion of a single nucleotide pair into a gene is most likely to cause which of the following?

Accepted Answer

A frameshift mutation

Question 3

Which enzyme is responsible for adding nucleotides to the growing DNA strand during replication?

Accepted Answer

DNA polymerase

Question 4

In bacteria, what is the significance of the fact that translation can begin before transcription is complete?

Accepted Answer

It allows for faster adaptation to environmental changes.

Question 5

Which of the following is NOT a function of plasmids in bacteria?

Accepted Answer

Encoding essential metabolic enzymes for survival

Question 6

A bacterial cell acquires a new gene from a bacteriophage. This process is known as:

Accepted Answer

Transduction

Question 7

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

Accepted Answer

There are 61 sense codons that encode 20 amino acids.

Question 8

During DNA replication, which enzyme is responsible for unwinding the DNA double helix?

Accepted Answer

Helicase

Question 9

Which type of horizontal gene transfer requires direct cell-to-cell contact?

Accepted Answer

Conjugation

Question 10

A missense mutation results in:

Accepted Answer

A change in the amino acid sequence of a protein

Question 11

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

Accepted Answer

Genotype is the genetic makeup; phenotype is the expression of the genes.

Question 12

Which of the following is a correct pairing of nitrogenous bases in DNA?

Accepted Answer

Adenine - Thymine

Question 13

Which process involves the transfer of 'naked' DNA from one bacterium to another?

Accepted Answer

Transformation

Question 14

What is the role of tRNA during translation?

Accepted Answer

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

Question 15

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

Accepted Answer

A premature stop codon

Question 16

Which of the following best explains why DNA replication is highly accurate?

Accepted Answer

The proofreading capability of DNA polymerase

Question 17

Which of the following is true about bacterial chromosomes?

Accepted Answer

They are circular and associated with proteins.

Question 18

Which of the following is an example of vertical gene transfer?

Accepted Answer

A parent cell passing its DNA to its daughter cells during cell division

Question 19

Which of the following is a direct result of a frameshift mutation?

Accepted Answer

A shift in the reading frame, altering all downstream amino acids

Question 20

Why is genetic diversity important for evolution in bacterial populations?

Accepted Answer

It allows for the survival of the fittest organisms in changing environments.

Microbial Genetics: Structure, Function, and Variability of Genetic Material

Study Guide - Practice Questions