A-LevelBiologyEnergy and respiration9700/43 · May/June 2018 · Q68 Marks
Fig. 6.1 is a diagram of part of a mitochondrion showing some of the events occurring in oxidative phosphorylation. [Figure 6.1]
- (a)(i)State two sources of the reduced NAD in [Fig. 6.1].[2]
- (a)(ii)With reference to [Fig. 6.1], outline the role of carriers in the inner membrane.[2]
- (a)(iii)With reference to [Fig. 6.1], name Y and Z. Y ................................................................. Z .................................................................[2]
- (b)Explain why it is an advantage to the cell for the inner membrane of the mitochondrion to be folded.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2018). The mark or mark type is shown in brackets.
- 6(a)(i) two from:
- glycolysis;
- link reaction;
- Krebs cycle;
- 6(a)(ii) two from:
- 1 splits H into electrons and H⁺ ;
- 2 ref. to electrons along, ETC / carriers, provides energy;
- 3 (energy) used to pump H⁺ into intermembrane space;
- 6(a)(iii) Y oxygen;
- Z ATP synthase / ATP synthetase ; A stalked particle R ATPase
- 6(b) two from:
- increase in surface area;
- more, carriers / ATP synthase / ETCs;
- more ATP (produced) ;
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