DNA helicase unzips double-stranded DNA to expose single-stranded section of DNA. New strands are generated using the original strand as a template. How do the newly-generated strands compare to the original template strands?

MOLECULAR BIOLOGY

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

DNA helicase “unzips” double-stranded DNA to expose single-stranded section of DNA. New strands are generated using the original strand as a template. How do the newly-generated strands compare to the original template strands?

A	They are identical
B	They are twice as long
C	They are much shorter
D	They are complementary

Explanation:

Detailed explanation-1: -Explanation: DNA helicase unwinds the double helix, separating the two strands so they may be replicated by DNA polymerase.

Detailed explanation-2: -To unwind a long stretch of DNA, a helicase has to move unidirectionally along the DNA and couple translocation to local base pair separation. As the helicase moves along the DNA, it successively makes and breaks interactions with the DNA.

Detailed explanation-3: -DNA replication occurs through the help of several enzymes. These enzymes “unzip” DNA molecules by breaking the hydrogen bonds that hold the two strands together.

Detailed explanation-4: -Key enzyme involved in DNA replication, it is responsible for ‘unzipping’ the double helix structure by breaking the hydrogen bonds between bases on opposite strands of the DNA molecule.

There is 1 question to complete.

AP BIOLOGY

LABORATORY REVIEW

MOLECULAR BIOLOGY