AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA REPLICATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is the second step of DNA replication?
A
adding complimentary nucleotides
B
closing the DNA strands
C
unzipping DNA
Explanation: 

Detailed explanation-1: -Elongation. Finally, elongation–the addition of nucleotides to the new DNA strand–begins after the primer has been added. Synthesis of the growing strand involves adding nucleotides, one by one, in the exact order specified by the original (template) strand.

Detailed explanation-2: -Step 2: Primer Binding. The leading strand is the simplest to replicate. Once the DNA strands have been separated, a short piece of RNA called a primer binds to the 3’ end of the strand. The primer always binds as the starting point for replication.

Detailed explanation-3: -The primary enzyme involved in this is DNA polymerase which joins nucleotides to synthesize the new complementary strand. DNA polymerase also proofreads each new DNA strand to make sure that there are no errors.

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