DP Biology (first assessment 2025)

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Question 22N.1A.SL.TZ0.9

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1A.SL.TZ0.9
Level SL Paper 1A Time zone TZ0
Command term Question number 9 Adapted from N/A
9.
[Maximum mark: 1]
22N.1A.SL.TZ0.9

The activity of amylase from two bacterial species and a fungus was measured at different pH levels and constant temperature. The results are shown in the graph.

[Source: Held, P., 2012. Enzymatic Digestion of Polysaccharides. Part II: Optimization of Polymer Digestion and Glucose Production in Microplates. Available at: https://www.agilent.com/cs/library/applications/enzymatic-digestion-of-polysaccharides-part-II-5994-3304EN-agilent.pdf.]

 

Which statement about the effect of pH on amylase can be concluded?

A.  A. oryzae amylase has the highest optimum pH.

B.  A change in pH affects amylase most in B. licheniformis.

C.  The optimum pH is 6 in B. subtilis.

D.  Amylase activity at pH 8 is the lowest in B. licheniformis.

[1]

Markscheme

C

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