Q: Which of the following equations best represents the process of ligation in recombinant DNA technology?

$$\text{DNA fragment}_1 + \text{DNA fragment}_2 \xrightarrow{\text{DNA ligase}} \text{Recombinant DNA}$$

Question 1

Which of the following best describes the main purpose of recombinant DNA technology?

Accepted Answer

To intentionally manipulate DNA by inserting or modifying genes to produce desired traits or products

Question 2

A scientist wants to produce human insulin using bacteria. Which of the following steps is NOT required in this process?

Accepted Answer

Exposing the bacteria to high temperatures to denature their proteins

Question 3

Which property is NOT essential for a DNA vector used in gene cloning?

Accepted Answer

Having a single-stranded RNA genome

Question 4

Restriction endonucleases are crucial in recombinant DNA technology because they:

Accepted Answer

Cut DNA at specific nucleotide sequences, creating sticky or blunt ends

Question 5

If a restriction enzyme recognizes the sequence $$5'	ext{GAATTC}3'$$ and cuts between G and A, what are the resulting ends called?

Accepted Answer

Sticky ends

Question 6

In the blue-white screening method, which outcome indicates a bacterial colony contains the recombinant plasmid with the gene of interest?

Accepted Answer

White colonies that grow on ampicillin and X-gal

Question 7

Why is DNA ligase necessary in the process of creating recombinant DNA?

Accepted Answer

It seals the sugar-phosphate backbone, joining DNA fragments together

Question 8

A plasmid vector contains an ampicillin resistance gene and a lacZ gene. After inserting a foreign gene into the lacZ site and transforming E. coli, which colonies should be selected for further study?

Accepted Answer

White colonies that are resistant to ampicillin

Question 9

Which of the following is a real-world application of recombinant DNA technology in agriculture?

Accepted Answer

Engineering plants to resist insect pests by inserting Bt toxin genes

Question 10

A scientist uses EcoRI to cut both a plasmid and a gene of interest. What is the advantage of using the same restriction enzyme for both?

Accepted Answer

It ensures the gene and plasmid have compatible sticky ends for ligation

Question 11

Which of the following equations best represents the process of ligation in recombinant DNA technology?

Accepted Answer

$$	ext{DNA fragment}_1 + 	ext{DNA fragment}_2 \xrightarrow{	ext{DNA ligase}} 	ext{Recombinant DNA}$$

Question 12

Which of the following is NOT a goal of recombinant DNA technology?

Accepted Answer

Increasing the natural mutation rate in wild populations

Question 13

A vector must contain a genetic marker. What is the primary function of this marker?

Accepted Answer

To identify cells that have successfully taken up the vector

Question 14

Which of the following best explains why viruses can be used as vectors in recombinant DNA technology?

Accepted Answer

They can infect a wide range of host cells and deliver genetic material efficiently

Question 15

During the process of gene cloning, what is the role of the host cell?

Accepted Answer

To replicate and express the recombinant DNA, producing the desired gene product

Question 16

Which of the following is a correct sequence of steps in making recombinant DNA?

Accepted Answer

Cut vector and gene with restriction enzyme, ligate fragments, introduce into host cell

Question 17

A researcher is using blue-white screening to identify recombinant bacteria. Which of the following best explains why white colonies are selected?

Accepted Answer

They have a disrupted lacZ gene due to insertion of the foreign gene and cannot hydrolyze X-gal

Question 18

Which of the following is a potential environmental application of recombinant DNA technology?

Accepted Answer

Cleanup of pollutants using genetically engineered bacteria

Question 19

If a plasmid vector is not small enough to manipulate in the lab, which of the following problems is most likely to occur?

Accepted Answer

It will be more difficult to introduce the plasmid into host cells

Question 20

Which of the following best describes a clone in the context of gene cloning?

Accepted Answer

A population of cells arising from one cell, each carrying the new gene of interest

Recombinant DNA and Gene Cloning: Microbiology Study Notes

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