Polymerase can be defined as ______________.

A. an enzyme used to synthesize a new DNA or RNA strand on the basis of pre-existing strand or at times without a pre-existing strand

B. an enzyme used for the removal of nucleotides from the DNA or RNA strand

C. an enzyme that can synthesize only a new DNA strand, not an RNA strand

D. an enzyme that can synthesize either a new DNA or an RNA strand but only when a strand is there

Explanation: The synthesis of a new DNA or RNA strand can be done either on the basis of a pre-existing strand or without it. Those which don’t require a pre-existing strand are known as template-free or template-independent.

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