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 needed only once on a 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 needed only once on a 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

Primase

Primase is the enzyme responsible for synthesizing the RNA primer during DNA replication. It creates a short segment of RNA by complementary base pairing with the DNA template, enabling DNA polymerase to attach and begin nucleotide addition. This enzyme is crucial for both leading and lagging strand synthesis.

DNA Replication

DNA replication is the process by which a cell duplicates its genetic material before cell division. It involves unwinding the double helix and synthesizing two new strands, each complementary to one of the original strands. This process is highly regulated and uses several enzymatic activities to ensure accuracy and efficiency in copying the genome.

RNA Primer

An RNA primer is a short strand of RNA that is synthesized during DNA replication to provide a free 3' hydroxyl group. DNA polymerase cannot initiate DNA synthesis de novo; it can only add nucleotides to an existing strand. The RNA primer is therefore essential for starting the synthesis of new DNA strands and is later removed and replaced with DNA.

Leading and Lagging Strand Synthesis

During DNA replication, the two strands are synthesized in distinct manners due to the antiparallel nature of DNA. The leading strand is synthesized continuously in the direction of the replication fork, requiring only one primer. In contrast, the lagging strand is synthesized discontinuously in short segments known as Okazaki fragments, each initiated by their own RNA primer.

Okazaki Fragments

Okazaki fragments are short, newly synthesized segments of DNA formed on the lagging strand during DNA replication. They are produced as the replication fork progresses and each fragment begins with an RNA primer. These fragments are later processed by the removal of the RNA primer and joining together by DNA ligase to form a continuous DNA strand.

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