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 traits.

Question 2

Which statement about the flow of genetic information in a cell is correct according to the central dogma?

Accepted Answer

Information flows from DNA to RNA to protein.

Question 3

During protein synthesis in prokaryotes, which process is regulated to ensure proper gene expression?

Accepted Answer

Transcription

Question 4

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

Accepted Answer

Splicing

Question 5

A scientist wants to compare the genomes of a prokaryote and a eukaryote. Which feature is most likely to differ between the two?

Accepted Answer

Presence of circular chromosomes in prokaryotes

Question 6

Which of the following mechanisms is most likely to result in horizontal gene transfer in bacteria?

Accepted Answer

Conjugation

Question 7

Which enzyme is responsible for synthesizing RNA from a DNA template during transcription?

Accepted Answer

RNA polymerase

Question 8

Which of the following best describes a spontaneous mutation?

Accepted Answer

A mutation that occurs naturally without external influence

Question 9

Which process is used to introduce foreign DNA into a bacterial cell in a laboratory setting?

Accepted Answer

Transformation

Question 10

Which of the following is a function of transposons in genetic diversity?

Accepted Answer

They can move within the genome, causing mutations and gene rearrangements.

Question 11

A bacterial cell undergoes generalized transduction. Which statement best describes this process?

Accepted Answer

A bacteriophage transfers random fragments of host DNA to another bacterium.

Question 12

Which of the following is a key difference between DNA and RNA?

Accepted Answer

DNA is double-stranded, while RNA is usually single-stranded.

Question 13

Which of the following equations correctly represents the complementary base pairing in DNA?

Accepted Answer

$$A = T, C = G$$

Question 14

A mutation changes a codon from $$UAC to$$ $$UAA. $$What type of mutation has occurred?

Accepted Answer

Nonsense mutation

Question 15

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 16

Which of the following is a real-world example of induced mutation?

Accepted Answer

A mutation caused by exposure to X-rays in a hospital setting.

Question 17

Which process is most likely to be used by a bacterium to repair a thymine dimer caused by UV radiation?

Accepted Answer

Nucleotide excision repair

Question 18

Which of the following best describes the Ames test?

Accepted Answer

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

Question 19

Which of the following is a direct result of horizontal gene transfer in bacteria?

Accepted Answer

Increased genetic diversity within a population.

Question 20

A scientist observes that a bacterial population has acquired resistance to an antibiotic after exposure to a plasmid carrying a resistance gene. Which process most likely occurred?

Accepted Answer

Conjugation

Genetics and Molecular Biology: Key Concepts and Mechanisms in Microbiology

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