$$\text{RNA} \xrightarrow{\text{reverse transcriptase}} \text{cDNA}$$

$$\text{Denaturation:}~94-98^\circ\text{C}$$, $$\text{Annealing:}~50-65^\circ\text{C}$$, $$\text{Extension:}~72^\circ\text{C}$$

Question 1

Which of the following best describes recombinant DNA technology?

Accepted Answer

The manipulation of DNA from different sources to create new genetic combinations.

Question 2

Which of the following is NOT one of the three main goals of recombinant DNA technology?

Accepted Answer

Producing organisms that are resistant to all known diseases.

Question 3

A scientist exposes a bacterial culture to a chemical mutagen. What is the most likely purpose of this experiment in the context of biotechnology?

Accepted Answer

To induce genetic variation for selection of desirable traits.

Question 4

Reverse transcriptase is used in biotechnology primarily to:

Accepted Answer

Synthesize DNA from an RNA template.

Question 5

Which equation best represents the action of reverse transcriptase?

Accepted Answer

$$	ext{RNA} \xrightarrow{	ext{reverse transcriptase}} 	ext{cDNA}$$

Question 6

Which of the following statements about restriction enzymes is TRUE?

Accepted Answer

They are produced by bacteria as a defense against viral DNA.

Question 7

A vector in genetic engineering is best defined as:

Accepted Answer

A DNA molecule used to transfer foreign genetic material into a cell.

Question 8

Which property is essential for a plasmid to be used as a vector in recombinant DNA technology?

Accepted Answer

It must contain an origin of replication.

Question 9

Which step in the Polymerase Chain Reaction (PCR) involves the separation of double-stranded DNA?

Accepted Answer

Denaturation

Question 10

During PCR, the temperature is cycled between three main steps. Which sequence correctly matches the steps with their typical temperature ranges?

Accepted Answer

$$	ext{Denaturation:}~94-98^\circ	ext{C}$$, $$	ext{Annealing:}~50-65^\circ	ext{C}$$, $$	ext{Extension:}~72^\circ	ext{C}$$

Question 11

Gel electrophoresis separates DNA fragments based on:

Accepted Answer

Size and charge

Question 12

In a Southern blot, what is the purpose of transferring DNA from a gel to a membrane?

Accepted Answer

To allow hybridization with labeled probes for detection of specific sequences.

Question 13

A scientist wants to clone a gene from human cells. Which sequence of steps is most appropriate?

Accepted Answer

Isolate mRNA, use reverse transcriptase to make cDNA, insert cDNA into a vector, transform bacteria.

Question 14

Which of the following best explains why restriction enzymes are useful in recombinant DNA technology?

Accepted Answer

They create specific cuts in DNA, allowing insertion of foreign genes at precise locations.

Question 15

A researcher uses PCR to detect a pathogen in a patient's blood. Which property of PCR makes it especially useful for this application?

Accepted Answer

PCR can amplify minute amounts of DNA to detectable levels.

Question 16

Which of the following is a common misconception about gel electrophoresis?

Accepted Answer

All DNA fragments move at the same speed regardless of size.

Question 17

A vector used in genetic engineering must have which feature to allow selection of transformed cells?

Accepted Answer

An antibiotic resistance gene

Question 18

Which of the following best describes the role of mutagens in biotechnology?

Accepted Answer

Mutagens are used to increase genetic diversity for selection of beneficial traits.

Question 19

A scientist wants to synthesize a specific DNA sequence for use in a cloning experiment. Which method is most appropriate?

Accepted Answer

Use automated DNA synthesizers to chemically synthesize oligonucleotides.

Question 20

Which of the following is a multi-step process that integrates several biotechnology concepts for gene analysis?

Accepted Answer

Isolate DNA, amplify with PCR, separate fragments by gel electrophoresis, transfer to membrane for Southern blot, probe for specific gene.

Microbiology Study Guide: Biotechnology and Recombinant DNA Technology

Study Guide - Practice Questions