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Explain the structure of DNA.

DNA is a polymer made up from monomer units. The monomers that make up a DNA molecule are called nucleotides. Nuceleotides are made up of a nucelic acid (adenine/guanine/thymine/cytosol); a five carbon sugar...
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Answered by Geraldine C. • Biology tutor
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Explain why an enzyme catalyses only one reaction.

Enzymes only have one active site which is only complementary to one specific substrate.
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Answered by Luckksha L. • Biology tutor
17965 Views

How do I gain the full marks in the question "Describe the stages of Eutrophication" (6 marks)?

Conveniently, there are roughly 6 main stages in the process of eutrophication, so if you can memorise each one, step by step, you are sure to scoring full marks! 1) Algae blooms block light 2) No photosynth...
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Answered by Amelia A. • Biology tutor
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What are the most important topics that I should revise?

Below is a list (by no means exhaustive!) of topics you are sure to encounter in A-level biology and are frequently big features in exam papers. If you are a GCSE student soon to be starting A-level, it woul...
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Answered by Amelia A. • Biology tutor
14664 Views

How do I answer a 'Describe and Explain' question?

Failing to distinguish between these two important command words can result in a lot of lost marks! ‘Describe’ involves writing a literal description of the data that is in front of you, may it be a graph or...
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Answered by Amelia A. • Biology tutor
70867 Views