CAIE A Level Biology 9700 · Cell structure

Cell structure: describe question

Describe5 marksChallenge

Table 1 shows some structural features of three organelles found in eukaryotic cells.

Feature	Organelle P	Organelle Q	Organelle R
Double membrane	yes	yes	no
Contains its own DNA	yes	no	no
Contains 70S ribosomes	yes	no	no
Involved in aerobic respiration	yes	no	no
Involved in modification and transport of proteins	no	no	yes
Present in both plant and animal cells	yes	yes	yes

Describe the structure and function of organelle P and organelle R, and describe how the ATP produced by organelle P supports the function of organelle R. Use the features in the table to identify the organelles.

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5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.

Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.

Cell structure: describe question

How this question is marked

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