Question 1

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

Accepted Answer

To intentionally modify genomes for practical purposes such as eliminating undesirable traits, combining beneficial traits, and synthesizing products needed by humans.

Question 2

A scientist wants to produce human insulin using bacteria. Which tool of recombinant DNA technology is most critical for allowing bacteria to express the human gene?

Accepted Answer

Reverse transcriptase

Question 3

Which equation correctly represents the exponential increase in DNA molecules during PCR, where $$n is $$the number of cycles?

Accepted Answer

$$2^n$$

Question 4

Restriction enzymes are used in recombinant DNA technology because they:

Accepted Answer

Cut DNA at specific palindromic sequences, producing sticky or blunt ends.

Question 5

Which of the following is a real-world application of gene libraries?

Accepted Answer

Identifying all genes present in a single chromosome for research and medical diagnostics.

Question 6

A researcher uses a gene gun to insert DNA-coated beads into plant cells. This method is best classified as:

Accepted Answer

Artificial injection

Question 7

Which property makes plasmids ideal vectors for recombinant DNA technology?

Accepted Answer

They contain recognizable genetic markers and can survive inside cells.

Question 8

Reverse transcriptase is used to produce cDNA from mRNA. Why is this important for expressing eukaryotic genes in prokaryotes?

Accepted Answer

cDNA is free of introns, allowing prokaryotes to express eukaryotic proteins.

Question 9

Which step in the PCR process involves heating the DNA to separate its strands?

Accepted Answer

Denaturation

Question 10

A scientist is mapping the genome of a pathogen to understand its metabolism and relatedness to other organisms. Which technique is most relevant?

Accepted Answer

Genetic mapping and nucleotide sequencing

Question 11

Which of the following is NOT a natural method for inserting DNA into cells?

Accepted Answer

Electroporation

Question 12

In gene therapy for cancer, why is the hTERT promoter used to drive expression of a toxin gene?

Accepted Answer

The hTERT promoter is active in rapidly dividing tumor cells, targeting them for destruction.

Question 13

Which equation would you use to calculate the mutation rate ($$R) if $$you introduce a mutagen to a population of $$N$$ cells and observe $$M$$ mutants?

Accepted Answer

$$R = \frac{M}{N}$$

Question 14

DNA fingerprinting is used in forensic science because:

Accepted Answer

Individuals can be identified by their unique DNA sequence patterns.

Question 15

Which of the following is a benefit of using subunit vaccines produced by recombinant DNA technology?

Accepted Answer

They are safer because they use only parts of the pathogen, reducing risk of infection.

Question 16

A patient’s blood is screened for a pathogen using a DNA microarray. What is the principle behind this technique?

Accepted Answer

Microarrays detect the presence of specific DNA sequences unique to pathogens.

Question 17

Which of the following is a plausible consequence of environmental DNA studies?

Accepted Answer

Identification of previously unknown microbial species in human environments.

Question 18

Why is it important to use the same restriction enzyme when combining DNA fragments from two different organisms?

Accepted Answer

It ensures that the fragments have compatible ends for ligation.

Question 19

Which step in the creation of a gene library involves the use of restriction enzymes?

Accepted Answer

Generating fragments of the genome to be inserted into vectors.

Question 20

Which of the following is a critical reason for sequencing the genomes of pathogens?

Accepted Answer

To relate DNA sequence to protein function and improve medical diagnosis.

Recombinant DNA Technology and Its Applications in Microbiology

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