Chemistry 9701 · AS & A Level · Polymerisation

Polymerisation — practice question

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

For enzymes to function in tissues, they generally need to be water-soluble. What does this imply about the side-chains on the outside of the molecules?

(b(i))

Describe briefly the primary, secondary and tertiary structures found in an enzyme.

(b(ii))

An enzyme’s activity depends on the tertiary structure of the protein molecule. Explain how the tertiary structure creates an effective active site.

(b(iii))[6]

Give two conditions that may lower enzyme activity, and explain the reason for each one.

(c(i))

Write the name of the enzyme responsible at each peak shown, choosing from amylase, pepsin or trypsin.

(c(ii))[3]

On the axes above, sketch the graph the third enzyme would produce, and write the enzyme’s name on it.

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/ionic, or able to hydrogen-bond, or hydrophilic

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