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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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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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How does DNA replication occur?

DNA normally exists in the cell as a double-stranded structure, comprising of two complementary strands that are held together by hydrogen bonds. DNA replication involves two main steps. Firstly, the enzyme ...
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Answered by Katharine H. • Biology tutor
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What is competitive inhibition in enzymes?

competitive inhibition occurs when the active site of the enzyme is complementary to the binding site of the inhibitor and so binds to form a complex. The inhibitor molecule therefore occupies the active sit...
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Answered by Sophie T. • Biology tutor
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