The primer used for DNA replication a. is a short strand of...

The primer used for DNA replication $a$. is a short strand of RNA added to the 3 ' end. $b$. is present only once on the leading strand. $c$. remains on the DNA after replication. d. ensures that there will be a free 5 ' end to which nucleotides can be added. $e$ is added to only one of the two template strands.

The primer used for DNA replication
$a$. is a short strand of RNA added to the 3 ' end.
$b$. is present only once on the leading strand.
$c$. remains on the DNA after replication.
d. ensures that there will be a free 5 ' end to which nucleotides can be added.
$e$ is added to only one of the two template strands.

Key Concepts

DNA Polymerase Primer Requirement

DNA polymerases are enzymes that can only add nucleotides to an existing strand that has a free 3’ OH group. This requirement necessitates the use of an RNA primer to initiate DNA synthesis, highlighting why the primer is a critical component of the replication process.

Strand Synthesis Directionality

Due to the antiparallel structure of the DNA double helix, DNA replication proceeds in a 5’ to 3’ direction. The RNA primer provides the starting point for the synthesis, particularly critical on the lagging strand where discontinuous synthesis takes place, leading to the formation of Okazaki fragments.

DNA Replication

DNA replication is the fundamental process by which a cell copies its entire genetic material before cell division. It involves the coordinated action of several enzymes and proteins, including helicases, primases, and DNA polymerases, to ensure that each daughter cell receives an exact copy of the genome.

RNA Primer

An RNA primer is a short strand of RNA synthesized by the enzyme primase during DNA replication. It provides the necessary free 3’ hydroxyl (OH) group that DNA polymerases require to begin DNA synthesis, as these enzymes can only add nucleotides to an existing 3’ end.

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