The diagram shows the shape of an enzyme and its substrate, before and after heating - HSC - SSCE Biology - Question 1 - 2016 - Paper 1

Enzymes are proteins that catalyze biochemical reactions, and their activity is highly dependent on temperature. Increasing the temperature often increases the kinetic energy of enzyme and substrate molecules, which leads to more frequent collisions and a higher likelihood of reactions occurring. However, if the temperature rises too much, the enzyme may denature, causing it to lose its functional shape and therefore cease activity. Given that the question implies a temperature increase, the most appropriate answer is (B) increase, as long as we assume the temperature does not exceed the optimal range where denaturation occurs.