1. Enzymes Mainly based on the exercises from http://www.biology-resources.com/biology-questions.html IGCSE Revision Questions http://biodeluna.wordpress.com
6. Guess the word... Reactions that build up molecules Reactions that break down molecules Combination of anabolic and catabolic reactions The molecule(s) the enzyme works on Molecule(s) produced by enzymes
29. In an experiment to investigate the influence of temperature on the rate of reaction of a mylase on a starch solution, the following results were obtained: Plot these results on a graph, with temperature on the horizontal axis. (a) Between 20º C and 35º C, what is the effect of temperature on the rate of reaction? (b) What appears to be the optimum temperature for the reaction between salivary amylase andstarch? (c) Why do you think the reaction starts to slow down above 44º C? (d) Why do you think the reaction stops completely above 50° C? 25 17 11 7 4.5 4 3 6.5 12.5 no change even after 30 min 20 25 28 31 33 37 44 47 50 55 Reaction time before iodine gave negative results/min Temperature ° C
30. In an experiment to investigate the influence of temperature on the rate of reaction of a mylase on a starch solution, the following results were obtained: Plot these results on a graph, with temperature on the horizontal axis. (a) Between 20º C and 35º C, what is the effect of temperature on the rate of reaction? (b) What appears to be the optimum temperature for the reaction between salivary amylase andstarch? (c) Why do you think the reaction starts to slow down above 44º C? (d) Why do you think the reaction stops completely above 50° C? REMEMBER : Test for starch: Iodine turns from brown to black 25 17 11 7 4.5 4 3 6.5 12.5 no change even after 30 min 20 25 28 31 33 37 44 47 50 55 Reaction time before iodine gave negative results/min Temperature ° C
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