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Question 18M.3.SL.TZ1.1c

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.SL.TZ1.1c
Level SL Paper 3 Time zone TZ1
Command term Evaluate Question number c Adapted from N/A
c.
[Maximum mark: 2]
18M.3.SL.TZ1.1c

A study was carried out on the activity of catalase in bacteria living in extreme environments. Catalase decomposes hydrogen peroxide (H2O2). The data were obtained for a strain of bacteria called Vibrio rumoiensis which exhibits high catalase activity.

(c)

Evaluate the claim that, based on the data, the optimum H2O2 concentration for catalase is 70 mM.

[2]

Markscheme

a. maximum peak / optimum around 70 mM 

b. but overlapping error bars around 70 mM 

c. no clear optimum / range between 60 − 90 mM 

d. may only be true for this strain Vibrio rumoiensis / other variables not reported (e.g. another form of catalase)

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