Why Must DNA Fragments Be Denatured During the Polymerase Chain

question 53

Multiple Choice

Why must DNA fragments be denatured during the polymerase chain reaction?

• A) Taq polymerase breaks down when heated.
• B) The repeated gene sequences are not present in double-stranded DNA.
• C) The primer must bind to a single-stranded template to synthesize double-stranded DNA.
• D) VNTRs have DNA sequences that vary in number.

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Definitions:

Antagonistic Pleiotropy

A hypothesis suggesting that a single gene can affect multiple traits in a way that is beneficial in some aspects but detrimental in others.

Hygiene Hypothesis

Suggests that a lack of early childhood exposure to infectious agents, symbiotic microorganisms, and parasites increases susceptibility to allergic diseases by suppressing the natural development of the immune system.

Alleles

Different versions of a gene that determine distinct traits that can be passed on to offspring.

Evolutionary History

The chronological sequence of biological events and processes that have led to the diversity of life and the traits observed in organisms today.