Question 1

Which of the following best explains why Taq polymerase is used in the polymerase chain reaction (PCR)?

Accepted Answer

It is resistant to high temperatures required for DNA denaturation.

Question 2

A scientist wants to amplify a specific region of DNA from a crime scene sample. Which two components are essential for targeting the correct DNA region during PCR?

Accepted Answer

Primers and heat-resistant DNA polymerase

Question 3

During gel electrophoresis, why do smaller DNA fragments move further through the gel than larger fragments?

Accepted Answer

Smaller fragments are less hindered by the gel matrix.

Question 4

A mutation destroys a restriction site in a gene associated with a genetic disorder. How would this affect the results of a restriction fragment length polymorphism (RFLP) analysis?

Accepted Answer

A new banding pattern would appear due to altered fragment sizes.

Question 5

Which of the following is a limitation of using prokaryotes to produce eukaryotic proteins?

Accepted Answer

Prokaryotes cannot process introns present in eukaryotic genes.

Question 6

A researcher uses CRISPR-Cas9 to edit a gene in a plant cell. What determines the specific location where Cas9 will cut the DNA?

Accepted Answer

The sequence of the guide RNA

Question 7

In DNA fingerprinting, which feature of short tandem repeats (STRs) makes them useful for identifying individuals?

Accepted Answer

They are highly variable in repeat number among individuals.

Question 8

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

Accepted Answer

It joins DNA fragments by forming phosphodiester bonds.

Question 9

A child has a DNA band not present in the mother. In a paternity test, what does this indicate?

Accepted Answer

The band must have come from the father.

Question 10

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

Accepted Answer

Detecting the presence of a specific pathogen in a patient sample

Question 11

Why is contamination a significant concern in PCR experiments?

Accepted Answer

Contaminants can be amplified along with the target DNA, leading to false results.

Question 12

Which step in PCR involves the binding of primers to single-stranded DNA?

Accepted Answer

Annealing

Question 13

A scientist wants to insert a human gene into a bacterial plasmid. Which sequence of steps is correct?

Accepted Answer

Cut plasmid and human DNA with the same restriction enzyme, mix, add ligase, introduce plasmid into bacteria.

Question 14

Which of the following statements about next-generation DNA sequencing is correct?

Accepted Answer

Light emission indicates that a nucleotide has been incorporated into the DNA strand.

Question 15

A patient’s genome is sequenced and found to have several known disease-associated mutations, but the patient is healthy. What does this suggest about genotype-phenotype relationships?

Accepted Answer

Not all mutations result in disease due to factors like incomplete penetrance or environmental influences.

Question 16

Which of the following is NOT a basic method used in genetic technologies?

Accepted Answer

Synthesizing proteins from amino acids

Question 17

Why are overlapping fragments important in DNA sequencing projects such as the Human Genome Project?

Accepted Answer

They allow the complete DNA sequence to be assembled from smaller pieces.

Question 18

Which of the following best describes the function of restriction enzymes in genetic engineering?

Accepted Answer

They cut DNA at specific nucleotide sequences, creating fragments with sticky or blunt ends.

Question 19

A forensic scientist compares DNA from a crime scene to a suspect using STR analysis. What result would indicate a match?

Accepted Answer

The suspect’s STR banding pattern matches the crime scene DNA at all tested loci.

Question 20

Which of the following is a key advantage of using CRISPR-Cas9 over traditional restriction enzymes for genome editing?

Accepted Answer

CRISPR-Cas9 can be programmed to target virtually any DNA sequence using a guide RNA.

Genetic Technologies: Methods and Applications in Modern Biology

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