Respiration Exam Questions

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Why is the overall reaction equation an over simplification of respiration?
Glucose is not the only respiratory substrate, there are others e.g. lipids and amino acids. Also glucose doesn't combine directly with oxygen, oxygen acts as the final electron acceptor.
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Herbicides interfere with electron transport by accepting electrons, suggest how this may cause plants to die.
No photophosphorylation in light dependent reactions which means no ATP is produced in photosynthesis. No reduced NADP is produced and no Calvin cycle converting GP to TP for glucose in respiration.
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Describe how a respirometer can determine the rate of respiration of bread mould.
CO2 absorbed by soda lime and rate of oxygen uptake measured by measuring distance moved by fluid x 2 pi R over time. Do repeats to calculate mean. Leave for 20 mins. Equalise manometer levels with syringe. Control tube with glass beads.
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Explain what is meant by decarboxylation and dehydrogenation
decarboxylation - removal of carbon dioxide, dehydrogenation - removal of hydrogen
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Explain why fat builds up in the liver with excessive alcohol intake if alcohol break down uses NAD.
NAD is used in alcohol breakdown which means it is limiting. Glucose is therefore not respired and stored as fat from fatty acids and glycerol.
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Explain why panting is necessary after a cheetah has chased prey.
Anaerobic respiration forms lactic acid which is oxidised to pyruvate in liver but O2 needed = O2 debt. Panting cools the body = heat can denature enzymes. Hb reoxygenated (and myoglobin) so ATP synthesized in muscle and more CO2 removed.
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Card 2

Front

Herbicides interfere with electron transport by accepting electrons, suggest how this may cause plants to die.

Back

No photophosphorylation in light dependent reactions which means no ATP is produced in photosynthesis. No reduced NADP is produced and no Calvin cycle converting GP to TP for glucose in respiration.

Card 3

Front

Describe how a respirometer can determine the rate of respiration of bread mould.

Back

Preview of the front of card 3

Card 4

Front

Explain what is meant by decarboxylation and dehydrogenation

Back

Preview of the front of card 4

Card 5

Front

Explain why fat builds up in the liver with excessive alcohol intake if alcohol break down uses NAD.

Back

Preview of the front of card 5
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