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Define osmosis.

Osmosis is the net movement of free water molecules from an area of high er water potential to an area of low er water potential through a partially permeable membrane . Water potential = a measure of the nu...
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Answered by Archie A. • Biology tutor
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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 specific . The shape determines the ...
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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 is ...
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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 phosphorylation (addition of phosphate ...
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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; (iii) ovaries; (b) in the blood; (c) (i) insulin; (ii) contains glucose/sugar;
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Answered by Niko M. • Biology tutor
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