Question 1

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

Accepted Answer

They cut DNA at specific sequences, allowing for the insertion or removal of genes.

Question 2

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

Accepted Answer

Cut plasmid and gene with the same restriction enzyme, ligate the gene into the plasmid, and transform bacteria with the recombinant plasmid.

Question 3

Which enzyme is responsible for joining DNA fragments together during genetic engineering?

Accepted Answer

DNA ligase

Question 4

In the context of PCR, what is the main purpose of the technique?

Accepted Answer

To amplify a specific region of DNA or RNA from a small sample.

Question 5

A forensic scientist finds a drop of blood at a crime scene. Which process would they most likely use to identify the individual from this sample?

Accepted Answer

PCR amplification of identifying DNA sequences followed by comparison to known DNA profiles.

Question 6

Which of the following is a critical step to avoid mis-handling of DNA evidence in forensic analysis?

Accepted Answer

Careful handling to prevent contamination and degradation of DNA samples.

Question 7

Which of the following equations correctly represents the exponential amplification of DNA during PCR, where $$n is $$the number of cycles and $$N_0 is $$the initial number of DNA molecules?

Accepted Answer

$$N = N_0$ 	imes 2^n$$

Question 8

Which of the following is NOT a typical application of PCR?

Accepted Answer

Directly joining two DNA fragments together.

Question 9

Why is it important to use the same restriction enzyme to cut both the plasmid and the gene of interest in genetic engineering?

Accepted Answer

To ensure compatible sticky ends for successful ligation.

Question 10

Which process allows bacteria to take up foreign DNA from their environment?

Accepted Answer

Transformation

Question 11

A researcher wants to identify a pathogen in a patient sample using PCR. What must be known before designing the PCR experiment?

Accepted Answer

The diagnostic DNA sequence of the pathogen.

Question 12

Which of the following best explains why PCR is useful in genetic engineering for 'pulling' DNA out of a complex genome?

Accepted Answer

PCR selectively amplifies only the target DNA region, making it easier to isolate.

Question 13

Which of the following is a plausible consequence of mishandling DNA evidence in a forensic case?

Accepted Answer

Contamination leading to incorrect identification of individuals.

Question 14

Which of the following is NOT a reason why plasmids are useful in genetic engineering?

Accepted Answer

They are large, complex chromosomes that are difficult to manipulate.

Question 15

A student is designing a genetic engineering experiment. Which combination of enzymes would be required to insert a gene into a plasmid?

Accepted Answer

Restriction enzyme and DNA ligase

Question 16

Which of the following best describes the process of transformation in bacteria?

Accepted Answer

Uptake of foreign DNA from the environment into the bacterial cell.

Question 17

In a PCR reaction, what would happen if the DNA sample was contaminated with another individual's DNA?

Accepted Answer

Amplification of DNA from both individuals, leading to ambiguous results.

Question 18

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

Accepted Answer

Detecting the presence of a specific pathogen in a patient sample.

Question 19

Which of the following steps is essential for ensuring the accuracy of PCR results in forensic analysis?

Accepted Answer

Using negative and positive controls to check for contamination and amplification efficiency.

Question 20

Which of the following statements about genetic engineering in bacteria is correct?

Accepted Answer

It involves modifying bacterial DNA using tools such as restriction enzymes, plasmids, and DNA ligase.

Genetic Engineering of Bacteria and the Principle of PCR

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