Textbook Question
The addition of a ----CH3 to a cytosine nucleotide after DNA replication is called: .
a. Methylation
b. Restriction
c. Transcription
d. Transversion
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14. DNA Replication
Steps of DNA Replication
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Which of the following enzymes breaks the hydrogen bonds between the DNA strands?
A
Primase.
B
Helicase.
C
Topoisomerase.
D
DNA ligase.
E
DNA polymerase.
Verified step by step guidance1
Understand the structure of DNA: DNA is composed of two strands forming a double helix, held together by hydrogen bonds between complementary bases.
Identify the role of enzymes in DNA replication: During replication, the two strands of DNA need to be separated to allow each strand to be copied.
Learn about Helicase: Helicase is an enzyme that unwinds the DNA double helix by breaking the hydrogen bonds between the two strands, allowing replication to proceed.
Differentiate Helicase from other enzymes: Primase synthesizes RNA primers, Topoisomerase relieves the tension in the DNA helix, DNA ligase joins DNA fragments, and DNA polymerase synthesizes new DNA strands.
Recognize the function of Helicase in the context of DNA replication: Helicase is specifically responsible for breaking the hydrogen bonds, which is crucial for the separation of DNA strands during replication.
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