Question 1

Which of the following best describes recombinant DNA technology?

Accepted Answer

The artificial manipulation and combination of DNA from two different sources.

Question 2

A scientist wants to produce large quantities of a human protein using bacteria. Which sequence of steps best describes the process?

Accepted Answer

Insert the human gene into a vector, introduce the vector into a bacterial cell, grow the cell to form a clone, and harvest the protein.

Question 3

Which of the following is NOT a property required for a DNA vector used in recombinant DNA technology?

Accepted Answer

Large size to accommodate multiple genes.

Question 4

Restriction enzymes are essential tools in recombinant DNA technology because they:

Accepted Answer

Recognize and cut DNA at specific nucleotide sequences.

Question 5

A researcher uses the polymerase chain reaction (PCR) to amplify a gene. What is the role of the 94°C step in PCR?

Accepted Answer

To denature the double-stranded DNA, separating it into single strands.

Question 6

Which method is commonly used to introduce foreign DNA into plant cells?

Accepted Answer

Gene gun (biolistics)

Question 7

Why is cDNA not considered synthetic DNA?

Accepted Answer

Because it is made from mRNA templates by reverse transcription.

Question 8

In blue-white screening, what does the appearance of white colonies indicate?

Accepted Answer

The bacteria contain the plasmid vector with the inserted foreign gene.

Question 9

Which of the following best describes the purpose of a genomic library?

Accepted Answer

To store and clone fragments representing the entire genome of an organism.

Question 10

A forensic scientist uses DNA fingerprinting to identify a suspect. Which technique is most likely used to visualize the DNA fragments?

Accepted Answer

Southern blotting

Question 11

Which of the following is an advantage of using Saccharomyces cerevisiae (yeast) for producing recombinant proteins?

Accepted Answer

Yeast cells can continuously secrete the gene product.

Question 12

Which of the following is a real-world application of RNA interference (RNAi)?

Accepted Answer

Silencing the expression of abnormal or disease-causing genes.

Question 13

A plant scientist uses Agrobacterium tumefaciens to introduce a new gene into a plant. What is the main advantage of using this bacterium?

Accepted Answer

It naturally transfers recombinant DNA into plant hosts.

Question 14

Which of the following is a potential problem associated with genetically modified organisms (GMOs)?

Accepted Answer

Unintended environmental impact due to gene transfer to non-target species.

Question 15

Which equation best represents the amplification of DNA during PCR after $$n$$ cycles, starting with a single DNA molecule?

Accepted Answer

$$2^n$$

Question 16

A patient is diagnosed with a genetic disease caused by a missing gene. Which biotechnology application could potentially cure this disease?

Accepted Answer

Gene therapy to replace the defective or missing gene.

Question 17

Which of the following best describes the role of bioinformatics in genome projects?

Accepted Answer

The use of computer applications to analyze genetic data.

Question 18

A scientist wants to identify a bacterial clone carrying a specific gene. Which method would be most effective?

Accepted Answer

Using a labeled DNA probe complementary to the gene of interest.

Question 19

Which of the following is a real-world example of the use of DNA technology to prevent disease?

Accepted Answer

Production of DNA vaccines containing cloned genes from pathogens.

Question 20

Which of the following best explains why strict safety standards are necessary when working with genetically modified microorganisms?

Accepted Answer

To prevent accidental release and potential environmental or health risks.

Study Guide: Biotechnology and DNA Technology in Microbiology

Study Guide - Practice Questions