Question 1

Which protein is responsible for unwinding the DNA double helix during bacterial DNA replication?

Accepted Answer

DnaB helicase

Question 2

Where does bacterial chromosome replication begin?

Accepted Answer

At the origin of replication (oriC)

Question 3

What is the function of the sliding clamp protein during DNA replication?

Accepted Answer

It tethers DNA polymerase to the DNA, preventing it from falling off

Question 4

Which enzyme replaces RNA primers with DNA during bacterial DNA replication?

Accepted Answer

DNA Pol I

Question 5

What is an Okazaki fragment?

Accepted Answer

A short DNA fragment synthesized discontinuously on the lagging strand

Question 6

Which of the following best describes the direction of DNA synthesis during bacterial chromosome replication?

Accepted Answer

Both strands are synthesized in the 5' to 3' direction

Question 7

What is the role of DNA gyrase during bacterial DNA replication?

Accepted Answer

It relieves DNA supercoiling ahead of the replication fork

Question 8

Which protein binds to terminator sequences to end DNA replication in E. coli?

Accepted Answer

Tus

Question 9

How does plasmid replication differ from chromosomal replication in bacteria?

Accepted Answer

Plasmids replicate autonomously and are usually smaller and circular

Question 10

Which of the following is TRUE about the initiation of bacterial DNA replication?

Accepted Answer

It is triggered by the accumulation of DnaA protein, which binds to 9-bp repeats upstream of the origin

Question 11

What is the function of RNase H during DNA replication?

Accepted Answer

It removes RNA primers from Okazaki fragments

Question 12

Which energy source is used by DNA ligase to seal nicks in bacterial DNA?

Accepted Answer

NAD

Question 13

Which of the following best describes the replisome?

Accepted Answer

A complex of enzymes that coordinates the synthesis of leading and lagging DNA strands

Question 14

In most archaea, the processes of DNA replication, transcription, and translation most closely resemble those of which group?

Accepted Answer

Eukaryotes

Question 15

Which of the following is a multi-step process that occurs during the elongation phase of bacterial DNA replication?

Accepted Answer

DnaA binds to the origin, DNA is unwound, and DNA Pol III synthesizes new DNA

Question 16

Which equation correctly represents the directionality of DNA synthesis?

Accepted Answer

$$5' \rightarrow 3'$$

Question 17

What is the main challenge faced by the cell when replicating supercoiled DNA?

Accepted Answer

Unwinding the DNA to allow replication machinery access

Question 18

Which of the following is NOT a feature of archaeal genomes?

Accepted Answer

Cells with a nuclear membrane

Question 19

Which proteins are responsible for separating ringed catenanes at the completion of bacterial DNA replication?

Accepted Answer

Topoisomerase IV, XerC, and XerD

Question 20

A mutation in the gene encoding the sliding clamp protein would most likely result in which of the following?

Accepted Answer

Frequent dissociation of DNA polymerase from the DNA template

Bacterial DNA Replication and Related Genomic Processes

Guida di studio - Domande di pratica