Helicase "unzips" the two strands of DNA. During DNA replication.
The answer to your question is A. Higher latitudes receive less radiation due to the curvature of the Earth.
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I believe the answer is a. crossing over
<span>The gene sequence containing an operator, promoter and repressor is known as an operon. These genes are called as structural genes. the operon is regulated by the presence/absence of the inducer such as glucose/lactose. It may also be a constitutive operon, which works all the time.</span>
