Q: Which equation best represents the denaturation step in PCR, where double-stranded DNA is separated into single strands?

$$\text{dsDNA} \xrightarrow{\text{heat}} \text{ssDNA}$$

Question 1

Which of the following best describes the primary goal of recombinant DNA technology in biotechnology?

Accepted Answer

To intentionally modify genomes of organisms for practical purposes

Question 2

A scientist wants to produce a eukaryotic protein in a prokaryotic cell. Which tool is most critical for this process?

Accepted Answer

Reverse transcriptase

Question 3

Which restriction enzyme listed in Table 8.1 recognizes the palindromic sequence $$	ext{GAATTC}$$?

Accepted Answer

EcoRI

Question 4

What is the main advantage of using restriction enzymes that produce blunt ends in recombinant DNA technology?

Accepted Answer

Blunt ends are nonspecific, allowing any two blunt end fragments to combine

Question 5

Which technique is used to amplify a specific DNA sequence in vitro, and what are its three main steps?

Accepted Answer

Polymerase Chain Reaction (PCR); denaturation, priming, extension

Question 6

A researcher uses a probe labeled with a fluorescent chemical to locate a gene on a chromosome. Which technique is being used?

Accepted Answer

Fluorescent in situ hybridization (FISH)

Question 7

Which vector property is essential for ensuring the genetic expression of an inserted gene in a host cell?

Accepted Answer

Ensures genetic expression of the gene

Question 8

A patient with severe combined immunodeficiency (SCID) is successfully treated by replacing a defective gene with a normal copy. Which application of recombinant DNA technology does this represent?

Accepted Answer

Gene therapy

Question 9

Which of the following is a real-world example of a transgenic organism created using recombinant DNA technology?

Accepted Answer

Tomato plants with a gene for salt tolerance

Question 10

What is the purpose of using DNA microarrays in genetic screening?

Accepted Answer

To screen individuals for inherited diseases caused by mutations

Question 11

Which artificial method is used to introduce DNA into a cell by applying an electrical current to puncture the cell membrane?

Accepted Answer

Electroporation

Question 12

A scientist wants to isolate a gene from a bacterial genome for insertion into a vector. Which tool would be most appropriate for cutting the DNA at specific sites?

Accepted Answer

Restriction enzymes

Question 13

Which of the following is a potential ethical concern associated with recombinant DNA technology?

Accepted Answer

Routine screening for untreatable or fatal diseases

Question 14

A farmer uses crops genetically modified to express the Bt toxin. What is the primary benefit of this modification?

Accepted Answer

Pest resistance

Question 15

Which equation best represents the denaturation step in PCR, where double-stranded DNA is separated into single strands?

Accepted Answer

$$	ext{dsDNA} \xrightarrow{	ext{heat}} 	ext{ssDNA}$$

Question 16

Which tool is used to transfer DNA from a gel to a nitrocellulose membrane for further analysis?

Accepted Answer

Southern blot

Question 17

A gene library is constructed by inserting recombinant vectors into bacterial cells. Which enzyme is used to join DNA fragments to the vector?

Accepted Answer

Ligase

Question 18

Which of the following is a plausible risk associated with transgenic organisms?

Accepted Answer

Triggering allergies in humans

Question 19

Which method is used to introduce DNA into larger eukaryotic cells by physically injecting the DNA?

Accepted Answer

Gene gun and microinjection

Question 20

Which of the following best describes the process of genetic mapping using restriction fragmentation?

Accepted Answer

Determining the relative location of DNA fragments produced by cleavage with restriction enzymes

Recombinant DNA Technology: Tools, Techniques, Applications, and Ethics

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