Question 1

Which of the following best describes the role of restriction enzymes in recombinant DNA technology?

Accepted Answer

They cut specific sequences of DNA, creating sticky or blunt ends for gene insertion.

Question 2

A scientist wants to clone a eukaryotic gene that contains introns. Which method should be used to ensure the gene can be expressed in bacteria?

Accepted Answer

Use reverse transcriptase to create complementary DNA (cDNA) from mRNA.

Question 3

Which of the following is a key advantage of using E. coli as a host for producing recombinant proteins?

Accepted Answer

It is easily grown and its genomics are well understood.

Question 4

During blue-white screening, what does the appearance of white colonies on X-gal and ampicillin plates indicate?

Accepted Answer

The bacteria contain a recombinant plasmid with foreign DNA inserted into the lacZ gene.

Question 5

Which process is used to amplify small quantities of DNA for analysis, such as in forensic microbiology?

Accepted Answer

Polymerase Chain Reaction (PCR)

Question 6

A researcher uses electroporation to introduce foreign DNA into bacterial cells. What is the primary effect of the electrical current in this process?

Accepted Answer

It forms temporary pores in the cell membrane, allowing DNA to enter.

Question 7

Which of the following best explains why cDNA libraries are preferred over genomic libraries for expressing eukaryotic genes in bacteria?

Accepted Answer

cDNA libraries contain only exons, which can be translated into protein in bacteria.

Question 8

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

Accepted Answer

Southern blotting

Question 9

A scientist is using a DNA probe to identify a bacterial colony containing a gene of interest. Which technique is being used?

Accepted Answer

Colony hybridization

Question 10

Which of the following statements about shuttle vectors is correct?

Accepted Answer

They are used to move cloned sequences among different organisms.

Question 11

Which enzyme is responsible for joining DNA fragments together during the creation of recombinant DNA?

Accepted Answer

DNA ligase

Question 12

In the context of gene therapy, what is the main goal of using CRISPR technology?

Accepted Answer

To correct genetic mutations at specific locations in the genome

Question 13

Which of the following best describes the function of small interfering RNAs (siRNAs) in gene silencing?

Accepted Answer

They bind to mRNA, leading to its destruction by the RNA-induced silencing complex (RISC).

Question 14

A forensic microbiologist is using DNA fingerprinting to identify a pathogen. Which step is essential for this process?

Accepted Answer

Amplifying DNA using PCR

Question 15

Which of the following is a real-world application of recombinant DNA technology in medicine?

Accepted Answer

Production of human insulin in E. coli

Question 16

Which of the following statements about metagenomics is correct?

Accepted Answer

It studies genetic material directly from environmental samples.

Question 17

A scientist is using Southern blotting to detect a specific gene in a DNA sample. Which of the following steps is NOT part of this process?

Accepted Answer

Amplifying DNA using PCR before gel electrophoresis

Question 18

Which of the following best explains why plant cells are advantageous for producing recombinant proteins?

Accepted Answer

They can be grown on a large scale at low cost and express eukaryotic genes easily.

Question 19

Which of the following is a multi-step process that involves the use of both restriction enzymes and DNA ligase?

Accepted Answer

Creation of recombinant DNA molecules

Question 20

A researcher is using site-directed mutagenesis. What is the main advantage of this technique?

Accepted Answer

It allows for targeted and specific changes in a gene sequence.

Chapter 9 - Biotechnology and DNA Technology: Study Notes for Microbiology

Study Guide - Practice Questions

Study Guide - Flashcards