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How is mRNA produced in the nucleus of a cell?

Genes in DNA encode protein molecules. The first step of expressing a gene is transferring the information in DNA to a messenger RNA (mRNA) molecule, by a process called transcription. DNA Helicase unwinds t...
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Answered by Jamie T. • Biology tutor
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How does the body increase heart rate in response to exercise?

Heart rate is controlled by the AUTONOMIC nervous system. This is the branch of the nervous system which does NOT require voluntary thought and action, unlike the SOMATIC branch. This means it relies upon de...
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Answered by Corey C. • Biology tutor
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What is the difference between Mitosis and Meiosis?

These processes are easily mixed up. Both Mitosis and Meiosis are typed of cell division, but the 2 processes end up with different results! I always find it helpful to think of it like this: MiTosis - (with...
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Answered by Maria B. • Biology tutor
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Explain why maltose can only be broken down by the enzyme maltase.

The active site of an enzyme is complementary (meaning, it fits perfectly) to a substrate (in this can the substrate being maltose). Once the maltose and maltase combine to form the enzyme-substrate complex,...
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Answered by Bradley P. • Biology tutor
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Describe the function of receptors in the skin?

The first thing that they do is detect a stimulus, this could be a change in temperature or sensation, then once they have done this they convert this into an impulse, which is eventually sent back to the br...
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Answered by Bradley P. • Biology tutor
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