Question 1

Which of the following statements best describes the difference between prokaryotic and eukaryotic genomes?

Accepted Answer

Prokaryotic genomes are usually a single circular chromosome located in the nucleoid, while eukaryotic genomes are multiple linear chromosomes sequestered within a membrane-bound nucleus.

Question 2

Which feature is unique to plasmids in prokaryotes?

Accepted Answer

They carry information required for their own replication and can confer survival advantages, but are typically not essential for cell survival.

Question 3

Why is DNA replication described as a semiconservative process?

Accepted Answer

Each new DNA molecule consists of one original (parental) strand and one newly synthesized (daughter) strand.

Question 4

According to the central dogma of genetics, what is the correct sequence of information flow?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 5

Which of the following best explains how genotype determines phenotype?

Accepted Answer

The genotype specifies which kinds of RNA and protein molecules are produced, which in turn determine the organism's physical features and functional traits.

Question 6

Which statement correctly describes the relationship between codons and amino acids?

Accepted Answer

A codon is a sequence of three nucleotides in mRNA that specifies a particular amino acid during translation.

Question 7

Which of the following is a key difference between bacterial (prokaryotic) and eukaryotic transcription?

Accepted Answer

Bacterial transcription requires only a single transcription factor, while eukaryotic transcription requires several transcription factors and involves mRNA processing before translation.

Question 8

A mutation that changes a single nucleotide base pair but does not alter the amino acid sequence of the resulting protein is called:

Accepted Answer

Silent mutation

Question 9

Which type of mutation is most likely to result in a nonfunctional protein due to a premature stop codon?

Accepted Answer

Nonsense mutation

Question 10

Frameshift mutations are generally more harmful than base pair substitutions because:

Accepted Answer

They change the reading frame, affecting all codons downstream of the mutation.

Question 11

Which process allows bacteria to acquire antibiotic resistance genes from other bacteria in their environment?

Accepted Answer

Horizontal gene transfer

Question 12

Which of the following best describes the role of the F factor in bacterial conjugation?

Accepted Answer

It is a plasmid that enables the formation of a sex pilus for DNA transfer between bacteria.

Question 13

Which of the following is NOT a method of horizontal gene transfer in bacteria?

Accepted Answer

Semiconservative replication

Question 14

A scientist exposes bacteria to UV radiation and observes an increased mutation rate. What is the most likely explanation?

Accepted Answer

UV radiation acts as a mutagen, increasing the frequency of mutations by a factor of 10 to 1000 times.

Question 15

Which of the following best explains why mutations are rare events in cells?

Accepted Answer

Cells have high-fidelity DNA polymerases that rarely make mistakes during DNA synthesis.

Question 16

Which of the following is true about the genetic material in mitochondria and chloroplasts of eukaryotes?

Accepted Answer

It is circular and resembles prokaryotic chromosomes, but only codes for a small percentage of the organelle's proteins.

Question 17

Which of the following best describes a point mutation?

Accepted Answer

A mutation that affects a single base pair in the DNA sequence.

Question 18

In a clinical scenario, a patient is treated with valacyclovir for cold sores caused by Herpes Simplex Virus 1. What is the mechanism of action of this drug?

Accepted Answer

It inhibits the virus's RNA polymerase, preventing viral genome replication.

Question 19

Which of the following is a correct statement about the regulation of protein synthesis in bacteria?

Accepted Answer

Some genes are constantly transcribed and translated, while others are regulated and only expressed in response to environmental changes.

Microbial Genetics: Structure, Function, and Genetic Variation

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