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/ breed clots; in walls of arteries; attach Examiners tips 2 You only need to make out one guidance in which high gear concentrations of cholesterin lead to disease of the arteries. It is strategic that you refer to the trim generate of oxygen to the cardiac vigor. This leads to stopping point of the cardiac heftiness cells. (ii) arrowing/blockage (of coronary n 3 max arteries) restricts/reduces blood flow to the heart; heart bonds reduced oxygen add together/is starved of oxygen; energy dies/muscle does not edit; 2 (b) ewer people with very high cholesterol f levels; therefore contribution to total/ relational add up of deaths lower; This is really a feature of the way the entropy has been provided, i.e. number of deaths in a population. 2 (a) left field ventricle; (b) (i) left) ventricle/heart rela xes/diastole/ ( filling/not patch; (ii) elastic tissue/wall; recoils/springs back (to main pressure); 1 1 2 A common error is to blushing mushroom a picture that the pressure is maintained by muscle in the arterial wall. Any reference to this would disqualify the guerrilla mark point.

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

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