Q: Which of the following best describes the central dogma of genetics?

$$\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$$

Question 1

Which of the following best describes the structure of a nucleotide found in DNA?

Accepted Answer

A phosphate group, a pentose sugar, and a nitrogenous base

Question 2

During DNA replication in bacteria, which enzyme is primarily responsible for removing supercoils ahead of the replication fork?

Accepted Answer

Gyrase

Question 3

Which of the following statements about prokaryotic chromosomes is correct?

Accepted Answer

They are typically circular and located in the nucleoid region.

Question 4

What is the main difference between the leading and lagging strands during DNA replication?

Accepted Answer

The leading strand is synthesized continuously, while the lagging strand is synthesized discontinuously.

Question 5

Which of the following best describes the central dogma of genetics?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 6

A bacterial cell is exposed to an antibiotic. Later, it is found to survive and pass on this resistance to its progeny. Which genetic element most likely conferred this advantage?

Accepted Answer

A resistance plasmid

Question 7

Which of the following is NOT a function of DNA methylation in bacteria?

Accepted Answer

Increasing the rate of translation

Question 8

During transcription in prokaryotes, which of the following is NOT a type of RNA produced?

Accepted Answer

Deoxyribosomal RNA (drRNA)

Question 9

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

Accepted Answer

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

Question 10

A mutation occurs in the gene encoding DNA polymerase, making it unable to synthesize DNA in the 5' to 3' direction. What is the most likely consequence?

Accepted Answer

DNA replication would be severely impaired or halted.

Question 11

Which of the following best describes the relationship between genotype and phenotype?

Accepted Answer

Genotype is the set of genes in the genome, while phenotype is the physical and functional traits expressed.

Question 12

Which of the following is true regarding plasmids in prokaryotes?

Accepted Answer

They are small, circular DNA molecules that replicate independently of the chromosome.

Question 13

During translation, which molecule brings amino acids to the ribosome according to the codon sequence of mRNA?

Accepted Answer

Transfer RNA (tRNA)

Question 14

Which of the following best explains why triphosphate deoxyribonucleotides are required for DNA synthesis?

Accepted Answer

They provide both the building blocks and the energy for polymerization.

Question 15

A scientist is studying a eukaryotic cell and observes that its chromosomes are linear and sequestered within a nucleus. What is another likely feature of this cell?

Accepted Answer

It is often diploid, containing two copies of each chromosome.

Question 16

Which of the following events occurs during the termination stage of translation in prokaryotes?

Accepted Answer

Release factors recognize stop codons and trigger the release of the polypeptide.

Question 17

Which of the following best describes the directionality of DNA synthesis by DNA polymerase?

Accepted Answer

5' to 3' direction

Question 18

A mutation in a bacterial cell prevents the function of topoisomerase. What is the most likely effect on DNA replication?

Accepted Answer

Supercoiling would not be relieved, hindering replication fork progression.

Question 19

Which of the following is a correct base pairing in DNA?

Accepted Answer

Adenine (A) pairs with Thymine (T)

Microbial Genetics: Structure and Replication of Genomes

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