In what ways can a primer for DNA synthesis by a DNA polymerase be provided?

What will be an ideal response?


Ans: DNA polymerases require a free 3?-OH end of either RNA or DNA, called a primer, in order to initiate DNA synthesis. In DNA replication, this is most often accomplished by the synthesis of a short RNA sequence from the DNA template by a primase, an RNA polymerase that does not require a free 3?-OH end. Primers can also be generated by the hybridization of an already synthesized RNA to the template strand, or by the nicking of a strand of the DNA. In some cases, a protein can directly prime the polymerization reaction.

Biology & Microbiology

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You discover a fungus that is associated with plant roots, with hyphae that actually penetrate the root cells and

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List the types of erectile tissue present in the penis, and explain how the penis becomes erect upon sexual stimulation. What will be an ideal response?

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