Biology 9700 · AS & A Level · Protein synthesis

Protein synthesis — practice question

A protein called mitosis-promoting factor (MPF) has been identified in cells. MPF is a globular protein composed of two polypeptide chains.
(a)[3]

Explain why mitosis is important in multicellular organisms.

(b)[1]

Put a tick (✓) in the box beside the type, or types, of protein structure that MPF shows.

(c)[4]

MPF is known to trigger the start of prophase. Describe the changes that take place during prophase in an animal cell.

(d)[3]

MPF usually starts to be broken down and ceases to function during anaphase. Suggest the possible consequences of MPF not breaking down.

Worked solution & mark scheme

This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: Increase in cell number for growth

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