Question 1

Which of the following best describes the natural function of the CRISPR/Cas9 system in bacteria?

Accepted Answer

It provides adaptive immunity by recognizing and destroying foreign nucleic acids.

Question 2

In the context of genome editing using CRISPR/Cas9, what is the role of the synthetic guide RNA (sgRNA)?

Accepted Answer

It binds to the target DNA sequence and directs Cas9 to the correct location for cleavage.

Question 3

Which process is hijacked during CRISPR-mediated genome insertion to incorporate new DNA into the genome?

Accepted Answer

Homologous recombination DNA repair system

Question 4

A researcher wants to delete a specific gene using CRISPR/Cas9. Which strategy should they use?

Accepted Answer

Create two cut sites flanking the gene, allowing the region to be excised and the ends joined together.

Question 5

Which of the following is a real-world application of CRISPR technology mentioned in the study materials?

Accepted Answer

Sterile insect technique for pest control

Question 6

During the CRISPR/Cas9 genome editing process, what is the significance of the PAM sequence?

Accepted Answer

It is necessary for Cas9 to recognize and cleave the target DNA.

Question 7

Which of the following steps occurs FIRST in the natural CRISPR/Cas9 immune response in bacteria?

Accepted Answer

A fragment of the virus genome is integrated into the bacterial DNA.

Question 8

If a scientist wants to insert a new gene into a bacterial genome using CRISPR/Cas9, which of the following must be true about the inserted DNA?

Accepted Answer

It must contain homologous sequences to the regions flanking the cut site.

Question 9

Which equation best represents the double-strand break repair mechanism utilized in CRISPR-mediated genome deletion?

Accepted Answer

$$DNA_{cut1} + DNA_{cut2} \rightarrow DNA_{joined}$$

Question 10

Which of the following is NOT a step in the CRISPR/Cas9 genome editing process for gene deletion?

Accepted Answer

Homologous recombination to insert a new gene

Question 11

A scientist uses CRISPR/Cas9 to create a double-strand break in a gene. What cellular process is most likely to repair this break if no template DNA is provided?

Accepted Answer

Non-homologous end joining (NHEJ)

Question 12

Which of the following statements about CRISPR/Cas9 is TRUE?

Accepted Answer

CRISPR arrays store sequences from previous viral infections as a genetic memory.

Question 13

In the CRISPR/Cas9 system, what is the consequence of a mismatch between the sgRNA and the target DNA sequence?

Accepted Answer

Cas9 will not bind or cleave the DNA at the mismatched site.

Question 14

Which of the following best explains why CRISPR/Cas9 is considered a powerful and precise tool for genome editing?

Accepted Answer

It uses a customizable guide RNA to target specific DNA sequences for editing.

Question 15

A scientist wants to use CRISPR/Cas9 to knock out a gene in a model organism. Which of the following outcomes would indicate a successful knockout?

Accepted Answer

The gene is deleted from the genome and its function is lost.

Question 16

Which of the following is a critical requirement for Cas9 to cleave DNA at a specific site?

Accepted Answer

Presence of a PAM sequence adjacent to the target site

Question 17

In a CRISPR/Cas9 experiment, a double-strand break is created at a target site. If a donor DNA with homologous arms is provided, which repair pathway is most likely to be used?

Accepted Answer

Homologous recombination

Question 18

Which of the following best describes the relationship between sgRNA and Cas9 in the CRISPR/Cas9 system?

Accepted Answer

sgRNA guides Cas9 to the specific DNA sequence to be cleaved.

Question 19

Which of the following equations represents the process of CRISPR-mediated genome insertion using homologous recombination?

Accepted Answer

$$DNA_{cut} + DNA_{donor} \rightarrow DNA_{recombined}$$

Chapter 13

Study Guide - Practice Questions

Study Guide - Flashcards