biology AS first test 0.0 / 5 ? Biologyhead start to AS biologyASAll boards Created by: charlieCreated on: 08-09-13 22:05 how many amino acids in each protein? 20 1 of 20 what do the amino acids contain? carbon, hydorgen, oxygen, nitrogen, (some sulfur) 2 of 20 primary structure the order in which amino acids are arranged in a protein 3 of 20 secondary structure chains coil up/fold to pleats held by weak forces of attraction (H2 bonds) 4 of 20 tertiary structure coiled amino acid chains folded into ball held together by both weak (H2 bonds) and strong bonds (sulfur bridges) 5 of 20 what is a protein called if it has a roughly spherical shape and what is an example of this? globular protein and an enzyme 6 of 20 what are genes? sets of coded instructions for building proteins 7 of 20 how many proteins does one gene code for? one 8 of 20 DNA stands for? Deoxyribonucleic acid 9 of 20 what are the 4 chemical bases? A, T, C, G 10 of 20 what does the sequence of bases determine? order in which amino acids are put together in particular protein 11 of 20 why do we need to breathe? allows air with higher O2 concentration taken into lungs and CO2 removed 12 of 20 what are the lungs suspended in? airtight throax 13 of 20 breathing in process intercostal musc. + diaphragm contract ---> throax vol inc. ---> dec pressure 14 of 20 breathing out process intercostal musc. + diaphragm relax ---> throax vol dec. ---> inc. pressure 15 of 20 is energy required to make valves in heart work? no, its the blood pressing on the valves 16 of 20 cardiac cycle process atria ---> contract to ventricles ---> contract to aorta + pulmonary artery ---> blood flows down arteries to atria + fills 17 of 20 what happens to the valves once blood has left the heart? shut to maintain high pressure in arteries + prevent backflow 18 of 20 what specialised cells produce electrical impulse? sino-atrial node 19 of 20 what supplies blood to the heart? coronary arteries come off aorta 20 of 20
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