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

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

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.

(a)

Describe the relationship between increasing H2O2 concentration and catalase activity.

[2]

Markscheme

a. as H2O2 concentration increases catalase activity increases / positive correlation
(up to 70 mM) 

b. peak activity at approximately 70 mM 

c. activity decreases after the peak

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