AS Biology (Instant Revision) by Steve Potter

By Steve Potter

Fast revision notes for AS, with self-check questions and grade-boosting tutorials in a convenient A5-sized ebook. Written by way of a senior examiner and skilled instructor who is familiar with what scholars want for that ultimate -- rapid -- check!Ready made revision notes conceal the complete of the AS direction and scale down on revision time. Self cost questions at each level be sure revision is lively and powerful. Grade-boosting tutorials from the examiner offer professional suggestion on the right way to resolution examination questions and what pitfalls to prevent.

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Sample text

Mitochondria contain all the Plasma membrane chemicals needed for aerobic respiration. g. the electron transport chain on the inner membrane of mitochondria. Initial substance (s) A Series of reactions B C Enzyme ● Enzyme Final product D Enzyme They control the passage of substances into and out of a cell. Methods of transport across a plasma membrane Diffusion is a passive process, requiring no extra input of energy from respiration. There is a net movement of particles from a high concentration to a lower one due to random movement of the particles.

G. histamine, which: ● dilate arterioles, allowing more blood to the area, bringing more lymphocytes; ● make capillaries more permeable, allowing many proteins to escape, including fibrin which causes clotting, preventing bacteria from entering the damaged blood vessels and spreading to other parts of the body. Active and passive immunity Active immunity involves an organism making antibodies to an antigen. g. g. exposure to antigens in a vaccine. g. across the placenta, not made in an immune response.

G. g. proteins) passes out of cell – exocytosis Vesicle Water molecules Distilled water Solution Golgi apparatus 27 Check yourself 1 (a) Name parts A – E on the diagram. (5) B E C (b) Through which of the labelled parts A might the following pass: a sodium ion Na+, a glucose molecule, a glycerol molecule? (3) (c) Why would a high temperature make the membrane freely permeable? (3) D 2 (a) Give two functions of membranes in cells, other than transport. (2) (b) Give four locations of membranes in a eukaryotic cell.

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