Biology Unit 1 Practse Paper

Unit 1 Answers to examination-style questions Answers 1 (a) (i) uild up of fatty deposits/atheroma/ b arterial sclerosis/plaque deposits/ bank line clots; in walls of arteries; label Examiners tips 2 You only need to give away one guidance in which high gear concentrations of cholesterin lead to disease of the arteries. It is strategic that you refer to the trim offer of oxygen to the cardiac vigor. This leads to stopping point of the cardiac go through cells. (ii) arrowing/blockage (of coronary n 3 max arteries) restricts/reduces blood flow to the heart; heart bonds reduced oxygen tot/is starved of oxygen; muscle dies/muscle does not trend; 2 (b) ewer people with very high cholesterin f levels; therefore contribution to total/ relational go of deaths lower; This is really a feature of the way the selective information has been provided, i.e. number of deaths in a population. 2 (a) left eye socket ventricle; (b) (i) left) ventricle/hea rt relaxes/diastole/ ( filling/not staining; (ii) elastic tissue/wall; recoils/springs back (to main pressure); 1 1 2 A common error is to pigment a picture that the pressure is maintained by muscle in the arterial wall. Any reference to this would disqualify the bite mark point.

3 (a) ffective pee/sewage treatment/ forbid e urine contamination/improve hygiene/ vaccination/quarantining of affected heavens; (b) ral rehydration therapy/ORT or oral o rehydration solvent/ORS; replaces lost eubstance of water supply and salts; OR drinking large amounts of water; with salts/minerals; (c) receptor/p roteins on membrane; complementary shape of ! exotoxin; (d) (i) busy transport; victimisation ATP/carrier proteins; (ii) igher solute concentration/water h strength lowered in small catgut; osmotic spill of water; 1 Any ii of these ideas for one mark. 2 Many students acknowledgement the sugar apply in ORT/ORS. This provides a source of respiratory substrate. The water helps rehydrate the body and the salts replace those that have been lost....If you want to get a in effect(p) essay, order it on our website: OrderCustomPaper.com

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