Multiple Choice
Which enzyme is responsible for adding complementary DNA bases to an exposed DNA strand during replication?
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14. DNA Synthesis
DNA Polymerases
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Which function of DNA polymerase is correct?
A
Removes RNA primers from the lagging strand
B
Synthesizes new DNA strands by adding nucleotides to a primer
C
Unwinds the DNA double helix during replication
D
Ligates Okazaki fragments on the lagging strand
Verified step by step guidance1
Understand the role of DNA polymerase in DNA replication. DNA polymerase is an enzyme that synthesizes new DNA strands by adding nucleotides to an existing strand or primer.
Recognize that DNA polymerase cannot initiate the synthesis of a new DNA strand on its own. It requires a primer, which is a short segment of RNA, to provide a starting point for nucleotide addition.
Identify the specific function of DNA polymerase in the context of the options provided. DNA polymerase's primary function is to add nucleotides to the 3' end of the primer, extending the new DNA strand.
Differentiate between the roles of other enzymes involved in DNA replication. For example, helicase unwinds the DNA double helix, and ligase joins Okazaki fragments on the lagging strand.
Conclude that the correct function of DNA polymerase, as per the options given, is to synthesize new DNA strands by adding nucleotides to a primer.
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