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 expression of those genes.

Question 2

During DNA replication in bacteria, which enzyme is responsible for synthesizing the new DNA strand by adding nucleotides in the 5' to 3' direction?

Accepted Answer

DNA polymerase

Question 3

Which of the following statements about the structure of DNA is correct?

Accepted Answer

DNA strands are antiparallel and held together by hydrogen bonds between complementary bases.

Question 4

A mutation that results in the substitution of one base for another, causing a change in a single amino acid in the protein product, is called:

Accepted Answer

Missense mutation

Question 5

Which process involves the transfer of genetic material from one bacterium to another via a sex pilus?

Accepted Answer

Conjugation

Question 6

In the regulation of bacterial gene expression, which type of enzyme is synthesized only in the presence of an inducer?

Accepted Answer

Inducible enzyme

Question 7

What is the role of the RNA primer during DNA replication?

Accepted Answer

It provides a starting point for DNA polymerase to begin synthesis.

Question 8

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

Accepted Answer

Transfer of DNA by a bacteriophage from a donor to a recipient cell

Question 9

A frameshift mutation can be caused by:

Accepted Answer

Insertion or deletion of one or more nucleotide pairs

Question 10

Which of the following is the correct sequence of events in the central dogma of molecular biology?

Accepted Answer

DNA → RNA → Protein

Question 11

During translation, what is the function of tRNA?

Accepted Answer

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

Question 12

Which of the following codons is the start codon for translation in most organisms?

Accepted Answer

AUG

Question 13

If the spontaneous mutation rate is $$1 	imes 10$$^{-6}$$ per replicated gene, what would be the expected mutation rate in the presence of a mutagen that increases the rate by 100 times?

Accepted Answer

$$1 	imes 10$$^{-4}$$

Question 14

Which of the following is true about bacterial plasmids?

Accepted Answer

They replicate independently from the cell's chromosome.

Question 15

A scientist is trying to detect penicillin-resistant mutants in a bacterial population. Which selection method should they use?

Accepted Answer

Direct (positive) selection

Question 16

Which of the following best describes the function of DNA ligase during DNA replication?

Accepted Answer

It joins Okazaki fragments together on the lagging strand.

Question 17

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

Accepted Answer

Transfer of DNA between cells of the same generation via conjugation

Question 18

What is the function of a repressible operon in bacterial gene regulation?

Accepted Answer

It is blocked by a repressor, preventing transcription in the presence of a corepressor.

Question 19

Which of the following best describes a transposon?

Accepted Answer

A segment of DNA that can move from one region of DNA to another

Question 20

A bacterial cell undergoes recombination, resulting in a new combination of genes on its chromosome. Which process most likely occurred?

Accepted Answer

Horizontal gene transfer

Microbial Genetics: Structure, Function, and Transfer of Genetic Information

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