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Describe the primary and secondary structure of proteins

Primary structure:
Due to the bonding and the shape and chemical nature of different amino acids, the shape of a whole chain of amino acids (a polypeptide or protein) is

Answered by Katerina S. • Biology tutor

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Describe the similarities and differences between animal and plant cells and the function of each component found in them.

An animals cell contains a cell membrane, nucleus, mitochondria, cytoplasm and ribosomes. A plant cell contains all of these components as well as a cell wall, chloroplasts and a vacuole. A cell membrane ...

Answered by Isobel B. • Biology tutor

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Explain the first stages of aerobic respiration that occur before the Krebs cycle.

Aerobic respiration is a controlled release of energy from organic compounds to produce ATP with the use of oxygen. It occurs in several stages:
Glycolysis starts with phospho...

Answered by Agata K. • Biology tutor

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(a) Name the organs which produce each of the following hormones. Choose from this list. ovaries brain liver stomach pancreas testes kidney (i) testosterone. (1 mark, 1 li

(a) (i) testes;
(ii) pancreas; ...

Answered by Niko M. • Biology tutor

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Outline the process of DNA replication

During DNA replication the double-stranded DNA helix is separated to single strands by the enzyme DNA helicase. This exposes the nucleic acid bases that encode the genetic sequence. Replication is then in...

Answered by Lorna W. • Biology tutor

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