Question 1

Which of the following best describes the function of a mutagen in recombinant DNA technology?

Accepted Answer

A mutagen is a physical or chemical agent that induces heritable changes in the nucleotide sequence of DNA.

Question 2

Why is reverse transcriptase particularly useful for producing eukaryotic genes in prokaryotic cells?

Accepted Answer

It creates complementary DNA (cDNA) from processed mRNA, which lacks introns that prokaryotes cannot remove.

Question 3

A scientist wants to synthesize a gene for a human protein to be expressed in bacteria. Which step is most critical to ensure the gene can be properly expressed in the bacterial host?

Accepted Answer

Using reverse transcriptase to create cDNA from processed mRNA.

Question 4

Which of the following is NOT a typical use of synthetic nucleic acids in biotechnology?

Accepted Answer

Directly sequencing proteins to determine their amino acid sequence.

Question 5

Restriction enzymes are named based on which of the following criteria?

Accepted Answer

The genus and species of the source bacterium, and sometimes the strain.

Question 6

What is the main advantage of using sticky ends generated by restriction enzymes in recombinant DNA technology?

Accepted Answer

Sticky ends allow for the easy and specific binding of complementary DNA fragments via hydrogen bonds.

Question 7

Which of the following is a key property of a vector used in genetic engineering?

Accepted Answer

It must contain a recognizable genetic marker to identify cells that have taken up the vector.

Question 8

The CRISPR-Cas system in prokaryotes provides which of the following functions?

Accepted Answer

It serves as an adaptive immune system by storing viral DNA sequences and using them to target and cut invading viral DNA.

Question 9

A gene library is best described as:

Accepted Answer

A collection of vectors, each containing a different fragment of an organism's genome.

Question 10

Which of the following best describes the polymerase chain reaction (PCR)?

Accepted Answer

A technique that uses cycles of heating and cooling to exponentially amplify a specific DNA segment.

Question 11

During PCR, what is the primary role of the primers?

Accepted Answer

They provide a starting point for DNA polymerase to extend the DNA strand.

Question 12

Why is Taq polymerase commonly used in PCR?

Accepted Answer

It is stable at the high temperatures required for DNA denaturation during PCR cycles.

Question 13

A researcher wants to identify which bacterial colonies contain a recombinant plasmid with a gene of interest. Which technique would be most appropriate?

Accepted Answer

Use a DNA probe labeled with a fluorescent marker that binds specifically to the gene of interest.

Question 14

Which of the following best explains the principle behind gel electrophoresis in DNA analysis?

Accepted Answer

DNA fragments are separated based on their size, with smaller fragments moving faster through the gel matrix.

Question 15

Which of the following is a major advantage of next-generation sequencing (NGS) over Sanger sequencing?

Accepted Answer

NGS can sequence millions of DNA fragments simultaneously, greatly increasing speed and throughput.

Question 16

A DNA microarray is primarily used to:

Accepted Answer

Measure the expression levels of thousands of genes simultaneously.

Question 17

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

Accepted Answer

Producing human insulin in bacteria for diabetes treatment.

Question 18

Gene therapy is best defined as:

Accepted Answer

The use of recombinant DNA technology to introduce functional genes into a patient's cells to treat disease.

Question 19

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

Accepted Answer

The potential for unintended consequences, such as the creation of new pathogens or ecological disruption.

Question 20

A farmer wants to grow crops that are resistant to a specific herbicide. Which recombinant DNA approach is most likely to achieve this?

Accepted Answer

Insert a gene from a bacterium that confers herbicide tolerance into the crop plant's genome.

Recombinant DNA Technology: Tools and Applications in Microbiology

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