Question 1

Which of the following best describes the difference between biotechnology and recombinant DNA technology?

Accepted Answer

Biotechnology is the broad application of biological systems for practical purposes, while recombinant DNA technology specifically refers to manipulating DNA from different sources to create new genetic combinations.

Question 2

A scientist wants to produce large quantities of human insulin using bacteria. Which of the following best describes the roles of a vector and a clone in this process?

Accepted Answer

A vector is the DNA molecule used to carry the gene of interest into a host cell, and a clone is a population of cells that all contain the recombinant DNA.

Question 3

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

Accepted Answer

It must be large enough to carry multiple genes of interest.

Question 4

A researcher uses a restriction enzyme to cut both a plasmid and a gene of interest, then ligates them together. Which property of restriction enzymes makes this possible?

Accepted Answer

They recognize specific palindromic DNA sequences and produce compatible sticky or blunt ends.

Question 5

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

Accepted Answer

Denaturation, annealing, extension

Question 6

A hospital is investigating a foodborne outbreak. Which application of DNA technology would be most useful for rapidly identifying the bacterial strain responsible?

Accepted Answer

DNA fingerprinting

Question 7

Which of the following is a key difference between cDNA and synthetic DNA?

Accepted Answer

cDNA is made from mRNA templates using reverse transcriptase, while synthetic DNA is chemically synthesized without a template.

Question 8

Which of the following methods is NOT commonly used to introduce recombinant DNA into a cell?

Accepted Answer

Ultracentrifugation

Question 9

A scientist is screening bacterial colonies for the presence of a recombinant plasmid containing an antibiotic resistance gene. Which method would be most effective for identifying successful clones?

Accepted Answer

Plating the bacteria on media containing the corresponding antibiotic

Question 10

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

Accepted Answer

It can perform post-translational modifications similar to those in mammalian cells.

Question 11

Which of the following best defines RNA interference (RNAi)?

Accepted Answer

A process by which double-stranded RNA induces the degradation of complementary mRNA, silencing gene expression.

Question 12

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

Accepted Answer

Production of human growth hormone in E. coli

Question 13

Which of the following best describes the Southern blotting procedure?

Accepted Answer

DNA fragments are separated by gel electrophoresis, transferred to a membrane, and hybridized with a labeled DNA probe.

Question 14

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

Accepted Answer

Unintended transfer of genes to non-target species

Question 15

Which of the following best describes random shotgun sequencing?

Accepted Answer

A method in which the entire genome is broken into random fragments, sequenced, and then assembled using computer algorithms.

Question 16

A plant biotechnologist uses Agrobacterium tumefaciens to introduce a gene for drought resistance into a crop. Which step is essential in this process?

Accepted Answer

Inserting the gene of interest into the Ti plasmid of Agrobacterium

Question 17

Which of the following is a correct application of bioinformatics?

Accepted Answer

Analyzing large sets of DNA sequence data to identify genes and predict their functions

Question 18

Which of the following is a key advantage of using mammalian cells for the production of therapeutic proteins?

Accepted Answer

They can perform complex post-translational modifications required for protein function.

Question 19

Which of the following best describes the process of DNA fingerprinting?

Accepted Answer

Comparing patterns of DNA fragments produced by restriction enzyme digestion and gel electrophoresis to identify individuals.

Question 20

Which of the following is a major advantage of genetically modifying plant cells?

Accepted Answer

Enhanced resistance to pests and environmental stresses

Study Guide: Microbiology Chapter 9 – Biotechnology and Recombinant DNA

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