Chemistry 9701 · AS & A Level · States of matter

States of matter — practice question

Enzymes are protein molecules that catalyse specific reactions in living organisms very efficiently.
(a)[1]

To function in tissues, enzyme molecules usually need to be water-soluble. What does this suggest about the side-chains on the outside of the molecules?

(b(i))

Briefly describe the primary, secondary and tertiary structures of an enzyme.

(b(ii))

The activity of an enzyme depends on the protein molecule’s tertiary structure. Explain how the tertiary structure creates a suitable active site.

(b(iii))[6]

State two conditions that can reduce enzyme activity, and explain the reason for each one.

(c(i))

For each peak shown, write the name of the enzyme responsible: amylase, pepsin or trypsin.

(c(ii))[3]

On the axes above, draw the graph that the third enzyme would give, and label it with that enzyme’s name.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: They are polar / hydrophilic or able to hydrogen-bond

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