Question 1

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

Accepted Answer

Genotype is the complete set of genes in the genome, while phenotype is the observable traits resulting from gene expression.

Question 2

During DNA replication in prokaryotes, which enzyme is responsible for synthesizing the RNA primer?

Accepted Answer

Primase

Question 3

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

Accepted Answer

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

Question 4

A mutation that results in the insertion of a single nucleotide into a coding sequence is most likely to cause:

Accepted Answer

A frameshift mutation

Question 5

Which of the following best explains why DNA replication is described as 'semiconservative'?

Accepted Answer

Each new DNA molecule consists of one parental and one newly synthesized strand.

Question 6

In the context of the lac operon, what happens when lactose is present in the environment?

Accepted Answer

Lactose inactivates the repressor, allowing transcription of the operon.

Question 7

Which of the following is a function of tRNA during translation?

Accepted Answer

It brings specific amino acids to the ribosome according to the mRNA codon.

Question 8

Which of the following best describes generalized transduction?

Accepted Answer

Transfer of random DNA segments from a donor to a recipient cell via a bacteriophage.

Question 9

Which enzyme is responsible for removing RNA primers and filling in the gaps with DNA during replication?

Accepted Answer

DNA polymerase I

Question 10

A bacterial cell is exposed to UV light, resulting in the formation of thymine dimers. Which DNA repair mechanism is most likely to directly reverse this damage?

Accepted Answer

Direct repair

Question 11

Which of the following is true regarding the difference between prokaryotic and eukaryotic genomes?

Accepted Answer

Prokaryotic genomes are typically circular and may include plasmids, while eukaryotic genomes are mostly linear and found in the nucleus.

Question 12

Which of the following best describes the role of the sigma factor in prokaryotic transcription?

Accepted Answer

It helps RNA polymerase recognize and bind to the promoter region.

Question 13

A mutation changes a codon from UAU (tyrosine) to UAA (stop codon). What type of mutation is this?

Accepted Answer

Nonsense mutation

Question 14

Which of the following is NOT a step in the process of DNA replication?

Accepted Answer

Transcription of DNA into RNA

Question 15

Which of the following statements about operons is correct?

Accepted Answer

Inducible operons, such as the lac operon, are activated by inducers, while repressible operons, such as the trp operon, are deactivated by repressors.

Question 16

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

Accepted Answer

Transfer of DNA between cells in direct contact, mediated by a pilus

Question 17

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

Accepted Answer

RNA polymerase can unwind and rewind DNA on its own, while DNA polymerase cannot.

Question 18

Which of the following codons is recognized as a start codon in translation?

Accepted Answer

$$\mathrm{AUG}$$

Question 19

A bacterial cell is found to be resistant to penicillin after infection by a bacteriophage. Which genetic process most likely explains this observation?

Accepted Answer

Generalized transduction

Question 20

Which of the following best describes the fate of mRNA in a bacterial cell after it is transcribed?

Accepted Answer

It is translated by ribosomes to synthesize proteins.

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

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