Question 1

Which of the following best describes the process of recombination in the context of rDNA technology?

Accepted Answer

The joining of two DNA fragments from different sources to form a new genetic combination.

Question 2

A scientist wants to amplify a specific gene from a bacterial sample. Which technique should they use, and what is the main purpose of the heating step in this process?

Accepted Answer

Polymerase Chain Reaction (PCR); heating denatures the DNA, separating the strands.

Question 3

Which of the following is NOT a common method for introducing foreign DNA into a cell?

Accepted Answer

Gel electrophoresis

Question 4

In biotechnology, what is a vector most commonly used for?

Accepted Answer

To carry and deliver foreign DNA into a host cell.

Question 5

Which of the following products is commonly developed using rDNA technology?

Accepted Answer

Human insulin

Question 6

A researcher uses electroporation to introduce DNA into bacterial cells. What is the principle behind this method?

Accepted Answer

Applying an electrical field increases cell membrane permeability, allowing DNA to enter.

Question 7

What is the main advantage of cloning in biotechnology?

Accepted Answer

It allows for the production of large quantities of a specific gene or protein.

Question 8

Which statement best distinguishes amplicon sequencing from shotgun sequencing?

Accepted Answer

Amplicon sequencing targets specific DNA regions, while shotgun sequencing randomly fragments the entire genome.

Question 9

During PCR, what is the role of cooling after the heating step?

Accepted Answer

Cooling allows primers to anneal to the single-stranded DNA.

Question 10

A biotechnologist wants to fuse two plant cells to create a hybrid. Which method should they use?

Accepted Answer

Protoplast fusion

Question 11

Which of the following best defines biotechnology?

Accepted Answer

The use of living organisms or their systems to develop products or processes for specific use.

Question 12

A scientist uses microinjection to introduce DNA into a cell. What is a potential limitation of this method?

Accepted Answer

It is technically challenging and requires specialized equipment.

Question 13

Which equation best represents the exponential amplification of DNA during PCR, where $n$ is the number of cycles?

Accepted Answer

$N = 2^n$

Question 14

A hospital needs to quickly identify a pathogen from a patient sample. Which sequencing method would be most efficient for targeting a specific gene region?

Accepted Answer

Amplicon sequencing

Question 15

Which of the following is a direct result of successful transformation in bacteria?

Accepted Answer

The bacteria express a new trait encoded by the foreign DNA.

Question 16

A researcher is using nanotechnology to improve DNA sequencing. Which benefit does nanotechnology provide in this context?

Accepted Answer

It increases the speed and accuracy of sequencing by enabling single-molecule analysis.

Question 17

Which step in PCR is responsible for synthesizing new DNA strands?

Accepted Answer

Extension

Question 18

A scientist wants to produce a genetically modified organism (GMO) that expresses a human protein. Which sequence of steps is most appropriate?

Accepted Answer

Isolate the gene, insert it into a vector, introduce the vector into the host cell, and select for expression.

Question 19

Which of the following is a plausible reason for using shotgun sequencing over amplicon sequencing?

Accepted Answer

To obtain a comprehensive analysis of the entire genome without prior knowledge of specific regions.

Biotechnology and DNA Technology: Key Concepts and Applications

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