Question 1

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

Accepted Answer

They cut DNA molecules at specific sequences called restriction sites, producing fragments with sticky ends.

Question 2

A scientist wants to clone a human gene in bacteria. Which of the following steps is necessary to ensure the gene is expressed correctly in the bacterial host?

Accepted Answer

Use an expression vector with a highly active bacterial promoter and remove introns from the gene.

Question 3

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

Accepted Answer

$$2^n$$

Question 4

Gel electrophoresis separates DNA fragments based on which property?

Accepted Answer

The length of the DNA fragments.

Question 5

A researcher uses the CRISPR-Cas9 system to knock out a gene in mosquitoes to prevent disease transmission. What is the main advantage of using CRISPR-Cas9 for this purpose?

Accepted Answer

It allows precise editing of specific genes in living organisms.

Question 6

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

Accepted Answer

Amplifying DNA from a crime scene for forensic analysis.

Question 7

Why are plasmids commonly used as cloning vectors in gene cloning?

Accepted Answer

They are small, circular DNA molecules that replicate independently and are easily manipulated.

Question 8

Which technique is most appropriate for comparing the expression levels of thousands of genes in different tissues?

Accepted Answer

DNA microarray assay

Question 9

A patient is diagnosed with chronic myelogenous leukemia (CML) due to overexpression of a tyrosine kinase. Which biotechnology product is used to treat this condition?

Accepted Answer

Imatinib, a small molecule inhibitor

Question 10

Which of the following statements about stem cells is correct?

Accepted Answer

Embryonic stem cells are pluripotent and can differentiate into many cell types.

Question 11

In the Sanger method of DNA sequencing, what is the function of dideoxynucleotides?

Accepted Answer

They terminate DNA strand synthesis at specific bases, enabling sequence determination.

Question 12

Which equation describes the probability $$P$$ that two unrelated individuals have the same genetic profile based on $$n$$ independent STR markers, each with $$k$$ possible alleles?

Accepted Answer

$$P = \frac{1}{k^n}$$

Question 13

Which of the following is a potential ethical concern associated with gene editing in human germ lines?

Accepted Answer

The possibility of deliberate efforts to control the genetic makeup of human populations (eugenics).

Question 14

A scientist uses in vitro mutagenesis to study gene function. What is the main purpose of this technique?

Accepted Answer

To introduce specific mutations into a cloned gene and observe the resulting phenotype.

Question 15

Which of the following best explains why cloned animals do not always look or behave exactly the same as their donor parent?

Accepted Answer

Epigenetic changes, such as DNA methylation and histone acetylation, affect gene expression.

Question 16

Which of the following is a major advantage of RNA-seq over DNA microarray assays?

Accepted Answer

RNA-seq does not require prior knowledge of genomic sequences.

Question 17

A gene therapy experiment uses retroviruses as vectors to deliver a therapeutic gene. What is a potential risk associated with this approach?

Accepted Answer

The retrovirus may insert near a gene that triggers uncontrolled cell proliferation, leading to leukemia.

Question 18

Which of the following is a real-world example of environmental biotechnology?

Accepted Answer

Using genetically engineered bacteria to degrade toxic waste in wastewater treatment.

Question 19

Which of the following statements about induced pluripotent stem (iPS) cells is correct?

Accepted Answer

iPS cells are produced by reprogramming differentiated cells using retroviruses carrying stem cell master regulatory genes.

DNA Tools and Biotechnology: Techniques, Applications, and Ethical Considerations

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