Home Biology Biotechnology and Its Application Skill Builder Given that PCR amplifies nucleic acids, whic…
Biology Biotechnology and Its Application Skill Builder Single Correct MCQ
Published on: August 13, 2026

Given that PCR amplifies nucleic acids, which principle best describes its utility in early pathogen detection in diseases like HIV and in identifying genetic mutations in cancer?

A
PCR selectively inhibits the replication of pathogen DNA, preventing disease progression.
B
PCR enhances the immune response by identifying the type of pathogen present.
C
PCR exponentially increases the number of copies of specific DNA segments, allowing for the detection of pathogens or mutations at very low concentrations.
D
PCR modifies the DNA of pathogens, making them easier to target with medications.

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The correct answer is:
C

PCR exponentially increases the number of copies of specific DNA segments, allowing for the detection of pathogens or mutations at very low concentrations. This characteristic of PCR makes it possible to detect the presence of pathogens or genetic mutations even when they are present in the body in very small amounts, which is essential for early diagnosis and intervention.

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