Question 1

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

Accepted Answer

Genotype refers to the genetic makeup, while phenotype refers to the observable characteristics.

Question 2

Which statement correctly compares the genomes of prokaryotes and eukaryotes?

Accepted Answer

Prokaryotic genomes are usually circular and found in the cytoplasm, while eukaryotic genomes are linear and located in the nucleus.

Question 3

Which of the following is a primary function of DNA in a cell?

Accepted Answer

Storing genetic information for inheritance.

Question 4

Which equation best represents the central dogma of molecular biology?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 5

During protein synthesis, which process occurs after transcription and before translation?

Accepted Answer

RNA splicing

Question 6

Which of the following is NOT a post-translational modification?

Accepted Answer

Transcription

Question 7

Which mechanism is responsible for regulating gene expression during protein synthesis?

Accepted Answer

Alternative splicing of mRNA

Question 8

Which of the following best describes a silent mutation?

Accepted Answer

A mutation that does not change the amino acid sequence due to redundancy in the genetic code.

Question 9

Which process is an example of horizontal gene transfer in bacteria?

Accepted Answer

Conjugation

Question 10

A scientist exposes bacteria to UV light, resulting in DNA damage. Which type of mutation is most likely to occur?

Accepted Answer

Induced mutation

Question 11

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

Accepted Answer

Transposons facilitate the movement of genetic elements within and between genomes.

Question 12

Which of the following is a key difference between transformation and transduction in bacteria?

Accepted Answer

Transformation involves uptake of naked DNA, while transduction involves transfer of DNA by a bacteriophage.

Question 13

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 14

Which of the following is a real-world example of generalized transduction?

Accepted Answer

A bacteriophage accidentally packages host DNA and transfers it to another bacterium.

Question 15

Which of the following best describes the Ames test?

Accepted Answer

A test to detect mutagenic potential of chemical compounds using bacteria.

Question 16

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

Accepted Answer

A mutation that changes a codon from $$GAA ($$glutamic acid) to $$GAC ($$aspartic acid).

Question 17

Which process is most likely to result in gene deletion mutations?

Accepted Answer

Unequal crossing over during recombination.

Question 18

Which of the following mechanisms is NOT a source of genetic variation in bacteria?

Accepted Answer

Binary fission

Question 19

Which of the following best describes specialized transduction?

Accepted Answer

Transfer of specific bacterial genes adjacent to prophage integration sites.

Question 20

A researcher wants to demonstrate genetic transformation in E. coli. Which of the following steps is essential?

Accepted Answer

Mixing E. coli with purified plasmid DNA and inducing competence.

Genetics and Molecular Biology: Key Concepts and Mechanisms in Microbiology

Study Guide - Practice Questions