Question 1

Which of the following best describes the role of restriction endonucleases in recombinant DNA technology?

Accepted Answer

They recognize specific DNA sequences and cleave DNA at those sites, producing fragments useful for cloning.

Question 2

A scientist wants to clone a human gene into a bacterial plasmid. After cutting both the gene and plasmid with the same restriction enzyme, what is the next essential step to ensure the gene is stably inserted?

Accepted Answer

Use ligase to seal the phosphate-sugar backbone between the gene and plasmid.

Question 3

Which property of DNA allows for the identification and replication of specific sequences during PCR?

Accepted Answer

DNA strands separate at high temperatures, exposing nucleotides for primer binding.

Question 4

A restriction enzyme recognizes the following sequence: 5'-GAATTC-3'. What is this type of sequence called?

Accepted Answer

Palindrome

Question 5

Which enzyme is required to produce complementary DNA (cDNA) from eukaryotic mRNA?

Accepted Answer

Reverse transcriptase

Question 6

During PCR, which of the following steps is responsible for the synthesis of new DNA strands?

Accepted Answer

Extension

Question 7

Why is Taq polymerase commonly used in PCR?

Accepted Answer

It is resistant to high temperatures required for PCR denaturation.

Question 8

A forensic scientist compares DNA samples from a crime scene and a suspect using restriction fragment length polymorphism (RFLP) analysis. What is the basis for distinguishing between individuals?

Accepted Answer

Differences in the cutting pattern of restriction enzymes, resulting in fragments of varying lengths.

Question 9

Which of the following is a disadvantage of the polymerase chain reaction (PCR) technique?

Accepted Answer

It is highly susceptible to contamination, which can lead to false results.

Question 10

Which feature is NOT desirable in a microbial cloning host for recombinant DNA technology?

Accepted Answer

Genome that is poorly mapped

Question 11

A scientist is using CRISPR-Cas9 to edit a gene in a plant. What is the primary function of the Cas9 enzyme in this process?

Accepted Answer

It recognizes and cuts foreign DNA at specific sites.

Question 12

Which cloning vector is naturally able to inject DNA into bacterial hosts through transduction?

Accepted Answer

Bacteriophage

Question 13

In gel electrophoresis, what determines the rate at which DNA fragments move through the gel?

Accepted Answer

The size of the DNA fragments

Question 14

Which of the following is a real-world application of DNA microarray technology?

Accepted Answer

Tracking the expression of thousands of genes to identify cancer subtypes for targeted therapy

Question 15

A patient with type A hemophilia is treated with a recombinant product. Which product is most likely used?

Accepted Answer

Recombinant factor VIII

Question 16

Which of the following best describes somatic cell gene therapy?

Accepted Answer

Genes are inserted into somatic cells, resulting in permanent changes for the individual but not for future generations.

Question 17

Which of the following is a genetically modified organism (GMO) created to prevent ice crystal formation in crops?

Accepted Answer

Pseudomonas syringae with altered genes

Question 18

A scientist is mapping single nucleotide polymorphisms (SNPs) in the human genome. What is the significance of SNPs?

Accepted Answer

They are single base changes that can affect individual traits and disease risk.

Question 19

Which equation best represents the exponential amplification of DNA during PCR, where $$n is $$the number of cycles?

Accepted Answer

$$2^n$$

Genetic Analysis and Recombinant DNA Technology: Tools, Techniques, and Applications

Guida di studio - Domande di pratica

Study guide - Flashcard