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How are polynucleotide DNA strands held together? (3 marks)

The two antiparallel strands of DNA are held together by hydrogen bonds joining the bases of each complementary nucleotide; Adenine is held to Thymine by 2 hydrogen bonds, and Guanine to Cytosine by 3 hydrog...
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Answered by Srishti A. • Biology tutor
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Why does an action potential travel faster in a myelinated neurone compared to a non-myelinated neurone?

Myelinated and non-myelinated neurones have different structures which is why the speed of action potentials differ. In a Myelinated neurone, a myelin sheath is wrapped around the axon. This myelin sheath is...
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Answered by Saima F. • Biology tutor
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What is the definition of Osmosis?

Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration through a selectively permeable membrane.
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Answered by Stuart R. • Biology tutor
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Based on structure, how is an enzyme's function affected by amino acids?

An enzyme is a type of protein, and proteins are made up of amino acids. The sequence of amino acids determines the shape of the enzyme, which in turns controls which substrates will or won't fit into the ac...
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Answered by Chester C. • Biology tutor
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Explain what autosomal linkage is

An autosomal linkage is when there are two gene loci found on the same autosomal chromosome, so they are quite likely to be inherited together. Vocabulary:Gene loci: The position of a gene on a chromosomeAut...
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Answered by Yasmin C. • Biology tutor
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