9700_s05_qp_4
A paper of Biology, 9700
Questions:
7
Year:
2005
Paper:
4
Variant:
0
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1
shows the molecular structure of ATP. Describe the main structural features of the molecule. Explain how ATP is able to transfer energy in cells. O C CH2 H OH H OH C H H O O O– P O O O– P O O– O– P O N N C C C C N H NH2 N C H [T State how ATP is synthesized in mitochondria. Examiner s Use
12. Energy and respiration  →  12.1. Energy
6. Nucleic acids and protein synthesis  →  6.1. Structure of nucleic acids and replication of DNA
12. Energy and respiration  →  12.2. Respiration
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3
[T is a diagram of a reflex arc. Explain briefly how the stimulus at the finger produces an impulse in the sensory neurone. Describe the role of the motor neurone in the reflex arc. Suggest why nerve impulses can only travel in one direction through the reflex arc. Use Not to scale spinal cord white matter relay neurone motor neurone grey matter ventral root motor-end plate muscle in arm pain receptor in skin sensory neurone stimulus
15. Control and coordination  →  15.1. Control and coordination in mammals
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5
[T shows the main stages of the Calvin cycle. State precisely where the Calvin cycle occurs in plant cells. Describe how carbon dioxide is fixed in the Calvin cycle. Explain how the products of photophosphorylation are used in the Calvin cycle. Explain what initially happens to the concentration of RuBP and GP if the supply of carbon dioxide is reduced. RuBP GP RuBP triose phosphate sucrose, starch, lipids, amino acids regeneration of RuBP GP (PGA) reduction carboxylation Use
13. Photosynthesis  →  13.1. Photosynthesis as an energy transfer process
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