IB Biology SL B1.2.5 Effect of Ph and Temperature Questions

Practise IB Biology SL B1.2.5 by linking heat, pH, salts or heavy metals to protein shape changes and enzyme activity loss.

Exam points

Identify heat, unsuitable pH, salts or heavy metals as causes of protein denaturation.
Explain how pH changes alter an enzyme’s active site and reduce substrate binding or activity.
Define denaturation as a change in protein three-dimensional shape that can remove biological activity.

[Maximum number: 1]

The diagrams represent the structure of a protein before and after it has become denatured.

Native protein

Outline one cause of denaturation in proteins.

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a	increase in temperature/heat;
b	change of pH;
c	salt;
d	heavy metals;