Question 1

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

Accepted Answer

Biotechnology refers to the use of living organisms or their components to make products, while rDNA technology specifically involves the insertion or modification of genes to produce desired proteins.

Question 2

Which property is NOT required for a DNA molecule to function as a vector in recombinant DNA technology?

Accepted Answer

It must be resistant to all antibiotics.

Question 3

A scientist wants to amplify a specific DNA sequence from a small sample. Which technique should they use, and what is the role of the 94°C step?

Accepted Answer

Use PCR; 94°C is for denaturing the DNA strands.

Question 4

Which of the following is a correct sequence of steps in the polymerase chain reaction (PCR)?

Accepted Answer

Denaturation $$\rightarrow$$ Annealing $$\rightarrow$$ Extension

Question 5

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

Accepted Answer

Producing human insulin using genetically modified E. coli.

Question 6

Why are restriction enzymes crucial in recombinant DNA technology?

Accepted Answer

They cut DNA at specific sequences, allowing insertion of foreign genes.

Question 7

Which method is used to introduce foreign DNA into a cell by creating temporary pores in the cell membrane using an electrical current?

Accepted Answer

Electroporation

Question 8

What is the main advantage of using Saccharomyces cerevisiae (yeast) instead of E. coli for producing eukaryotic gene products?

Accepted Answer

Yeast can express eukaryotic genes more efficiently.

Question 9

Which of the following best describes gene therapy?

Accepted Answer

Replacing defective or missing genes with functional ones to treat disease.

Question 10

A forensic scientist is using DNA fingerprinting to identify a suspect. Which principle is this technique based on?

Accepted Answer

Mutations that have accumulated in DNA over time.

Question 11

Which of the following is a potential ethical concern related to the use of DNA technology?

Accepted Answer

Who will have access to an individual's genetic information.

Question 12

Which of the following is a 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 13

Which of the following is NOT a step in the process of making recombinant DNA?

Accepted Answer

Denaturing proteins with heat.

Question 14

A scientist uses the following recognition sequence for a restriction enzyme: $$5'	ext{GAATTC}3'$$ and $$3'	ext{CTTAAG}5'. $$Which enzyme is being used?

Accepted Answer

EcoRI

Question 15

Which of the following is a reason why E. coli is commonly used to produce gene products in biotechnology?

Accepted Answer

Its genomics are well understood and it is easily grown.

Question 16

Which of the following best describes the concept of metagenomics?

Accepted Answer

The study of genetic material directly from environmental samples.

Question 17

A patient is treated with a subunit vaccine produced in genetically modified yeast. What is the advantage of this approach?

Accepted Answer

It uses only pathogen proteins, reducing the risk of infection.

Question 18

Which of the following is an example of site-directed mutagenesis?

Accepted Answer

Introducing a specific nucleotide change in a gene to alter its function.

Question 19

Which of the following is a key difference between transformation and protoplast fusion for introducing foreign DNA into cells?

Accepted Answer

Transformation involves uptake of DNA from the environment, while protoplast fusion involves fusing cells without cell walls.

Question 20

If a scientist starts with 1 copy of DNA and runs 5 cycles of PCR, how many copies of DNA will be present at the end, assuming perfect doubling each cycle? Use the formula $$N = N_0$ 	imes 2^n$$ where $$N_0 is $$the initial number of DNA molecules and $$n is $$the number of cycles.

Accepted Answer

$$N = 1 	imes 2^5$ = 32$$

Biotechnology and DNA Technology: Microbiology Study Guide

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