DNA Structure and Replication
The role of primase is to

proofread base pairing
cleave and unwinds short sections of DNA ahead of the replication fork
dismantle RNA primer
synthesize an RNA primer to begin the elongation process

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DNA Structure and Replication
In DNA, nucleotides are covalently joined together by

2', 5' phosphodiester bonds to form a repetitive sugar-phosphate chain
3', 4' phosphodiester bonds to form a repetitive sugar-phosphate chain
3', 5' phosphodiester bonds to form a repetitive sugar-phosphate chain
2', 3' phosphodiester bonds to form a repetitive sugar-phosphate chain

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DNA Structure and Replication
In DNA, there are

three bases known as adenine, guanine and cytosine
four bases known as adenine, guanine, thymine and cytosine
five bases known as adenine, guanine, thymine, tryptophan and cytosine
only two bases known as adenine and cytosine

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