Question 1

Which of the following best describes the primary goal of recombinant DNA technology in biotechnology?

Accepted Answer

To intentionally modify genomes of organisms for practical purposes

Question 2

A scientist wants to produce a large quantity of a specific DNA fragment in vitro. Which technique should they use, and what are the three main steps involved?

Accepted Answer

Polymerase chain reaction (PCR); denaturation, priming, extension

Question 3

Why was the discovery of hyperthermophilic bacteria critical for the practical use of PCR?

Accepted Answer

Their DNA polymerase can withstand the high temperatures required for denaturation

Question 4

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

Accepted Answer

It must be small enough to manipulate in a laboratory

Question 5

A researcher uses EcoRI to cut a plasmid and a gene of interest. What type of ends does EcoRI produce, and why is this useful for cloning?

Accepted Answer

Sticky ends; they facilitate the annealing of complementary DNA fragments

Question 6

During gel electrophoresis, which DNA fragments migrate the farthest from the wells, and why?

Accepted Answer

The smallest fragments, because they move more easily through the agarose matrix

Question 7

Which artificial method of introducing DNA into cells involves using an electrical field to increase cell membrane permeability?

Accepted Answer

Electroporation

Question 8

A scientist wants to locate a specific gene within a bacterial genome. Which tool or technique would be most appropriate?

Accepted Answer

Genetic mapping

Question 9

Which of the following best explains why restriction sites are often palindromic sequences?

Accepted Answer

Restriction enzymes recognize and bind to palindromic sequences, allowing for precise and predictable DNA cleavage

Question 10

A patient is diagnosed with a genetic disorder caused by a single gene mutation. Which recombinant DNA technology application could be used to diagnose this condition?

Accepted Answer

DNA microarray

Question 11

Which of the following is a correct sequence of steps for producing a recombinant plasmid containing a gene of interest?

Accepted Answer

Isolate plasmid → Cut plasmid and gene with restriction enzyme → Ligate gene into plasmid → Transform bacteria

Question 12

Which of the following equations correctly represents the exponential amplification of DNA during PCR, where $$n is $$the number of cycles?

Accepted Answer

$$N = 2^n$$

Question 13

A researcher is using a gene gun to introduce DNA into plant cells. What is the main advantage of this method compared to microinjection?

Accepted Answer

It allows for the transformation of many cells simultaneously

Question 14

Which of the following is a real-world application of synthetic nucleic acids in recombinant DNA technology?

Accepted Answer

Creating DNA probes to locate specific sequences of nucleotides

Question 15

A laboratory is comparing the genomes of two bacterial strains to determine their relatedness. Which technique would be most appropriate for this analysis?

Accepted Answer

Next-generation DNA sequencing (NGS)

Question 16

Which of the following statements about mutagens in recombinant DNA technology is correct?

Accepted Answer

Mutagens are used to create changes in microbial genomes to select for beneficial traits

Question 17

A scientist is using a Southern blot to identify a specific DNA sequence in a sample. Which step is unique to this technique compared to gel electrophoresis alone?

Accepted Answer

Transferring DNA from the gel to a membrane and hybridizing with a labeled probe

Question 18

Which of the following best explains the use of selectable markers in cloning vectors?

Accepted Answer

They allow for the identification of cells that have successfully taken up the vector

Question 19

Which of the following is a correct description of protoplast fusion in recombinant DNA technology?

Accepted Answer

It fuses cells whose cell walls have been removed to make hybrid cells

Question 20

A hospital is investigating an outbreak of a viral disease. Which recombinant DNA technique would be most useful for rapidly identifying the viral genome in patient samples?

Accepted Answer

Polymerase chain reaction (PCR)

Recombinant DNA Technology: Tools, Techniques, and Applications

Study Guide - Practice Questions

Study Guide - Flashcards