Question 1

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

Accepted Answer

Genotype is the set of alleles present in an organism, while phenotype is the physical expression of those alleles.

Question 2

Which of the following statements correctly compares the genomes of prokaryotes and eukaryotes?

Accepted Answer

Prokaryotic genomes are usually a single circular DNA molecule, while eukaryotic genomes are multiple linear chromosomes located in the nucleus.

Question 3

Which of the following best describes the flow of genetic information in a cell, according to the central dogma?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 4

During which stage of gene expression is mRNA synthesized from a DNA template?

Accepted Answer

Transcription

Question 5

Which of the following is NOT a function of RNA in the cell?

Accepted Answer

Storing genetic information long-term

Question 6

Which of the following best describes a silent mutation?

Accepted Answer

A mutation that does not change the amino acid sequence of the protein

Question 7

Which of the following mechanisms is an example of horizontal gene transfer in bacteria?

Accepted Answer

Transformation

Question 8

Which of the following best describes generalized transduction?

Accepted Answer

Transfer of any bacterial gene by a bacteriophage during the lytic cycle

Question 9

Which of the following is a post-translational modification, and why is it important?

Accepted Answer

Phosphorylation; it can activate or deactivate proteins, affecting cellular processes.

Question 10

Which of the following best describes the Ames test?

Accepted Answer

A test to assess the mutagenic potential of chemical compounds using bacteria

Question 11

Which of the following is an example of an induced mutation?

Accepted Answer

A mutation caused by exposure to ultraviolet light

Question 12

Which of the following best describes the role of transposons in genetic diversity?

Accepted Answer

Transposons are mobile genetic elements that can move within the genome, creating mutations and increasing genetic variation.

Question 13

Which of the following is a key difference between vertical and horizontal gene transfer?

Accepted Answer

Vertical gene transfer occurs from parent to offspring, while horizontal gene transfer occurs between unrelated organisms.

Question 14

Which of the following best describes a missense mutation?

Accepted Answer

A mutation that changes one amino acid to another in the protein

Question 15

Which of the following is a mechanism by which bacteria can acquire new genetic material from their environment?

Accepted Answer

Transformation

Question 16

Which of the following best describes the process of conjugation in bacteria?

Accepted Answer

Transfer of DNA from one bacterium to another via a pilus

Question 17

Which of the following is an example of a nonsense mutation?

Accepted Answer

A mutation that changes a codon for an amino acid into a stop codon

Question 18

Which of the following best explains why the genetic code is considered redundant?

Accepted Answer

Multiple codons can code for the same amino acid.

Question 19

Which of the following is a real-world example of gene regulation in bacteria?

Accepted Answer

The lac operon in Escherichia coli, which is activated in the presence of lactose.

Question 20

Which of the following best describes the function of mRNA during protein synthesis?

Accepted Answer

mRNA carries the genetic code from DNA to the ribosome for translation into protein.

Genetics and Molecular Biology: Key Concepts and Mechanisms

Study Guide - Practice Questions