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Biology 9: Unit 4b  Data Analysis Practice 			Name: __________________________
1.	Inflammation of human tissues often causes pain. Cyclooxygenases (COX) are a group of enzymes that play a role in causing inflammation. Analgesics are drugs that can reduce pain. The graph below shows how increasing concentrations of the analgesic drug dipyrone, affects the activity of three different cyclooxygenases, COX-1, COX-2 and COX-3.
	
 (a)	Outline the relationship between dipyrone concentration and COX-3 activity.
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(b)	Deduce whether dipyrone is an inhibitor of COX-2.
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2.	The graph below shows the results of an experiment to determine the effect of salt (NaCl) concentration on photosynthesis of the freshwater green alga Chlorella vulgaris. The experiment attempted to determine the effect of salt concentration on the light-dependent reactions overall and separately on photosystem I and photosystem II.

(a)	Describe the effect of salt concentration on the activity of the light-dependent reactions overall.
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(b)	Compare the effect of increasing salt concentration on photosystem I with the effect on photosystem II.
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 (c)	Using the graph, predict the effect of high salt concentration on the growth of Chlorella vulgaris. Give a reason for your answer.
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IB Questionbank Biology