Respiration Exam Questions and
Answers
Summarise the importance of coenzymes in respiration. - ANSWER-Coenzyme A:
- Transfers acetyl from link reaction to Krebs Cycle.
ADP/ATP:
- Phosphorylation of glucose to form hexose 1-6 bisphosphate in glycolysis.
- Removal of phosphate group from TP in glycolysis.
- Removal of phosphate group from intermediate in Krebs Cycle.
- Formation of substrate level phosphorylation.
NAD:
- Oxidation (removal of) H/electrons from triose bisphosphate in glycolysis.
- Removal of H/electrons from pyruvate in link reaction.
- Removal of H/electrons from intermediates in Krebs Cycle.
- Addition of electrons to electron transport chain.
- Addition of electrons to pyruvate in lactate fermentation.
- Addition of electrons to ethanal in alcoholic fermentation.
FAD:
- Oxidation/removal of H/removal of electrons from intermediates in Krebs Cycle.
What properties of the mitochondrial inner membrane allow chemiosmosis to occur? -
ANSWER-- Mostly impermeable H+ ions.
- Large surface area.
- Presence of ATP synthase.
Describe two quantitative changes in the inter-membrane space which occur as a result
of oxidative phosphorylation. - ANSWER-- pH decreases.
- Becomes more positively charged.
Explain how having a larger number of proton pores in the inner mitochondrial
membrane would result in a person being less likely to gain weight. - ANSWER-- Larger
number of proton pores results in protons leaking back into the matrix.
- Reduces yield of ATP from chemiosmotic gradients.
- Less ATP is made from oxidative phosphorylation.
- More energy wasted as heat energy from chemiosmosis is decoupled from ATP
synthesis.
- Energy yield from aerobic respiration reduced per molecule of glucose.
- Food not converted to ATP as efficiently.
Answers
Summarise the importance of coenzymes in respiration. - ANSWER-Coenzyme A:
- Transfers acetyl from link reaction to Krebs Cycle.
ADP/ATP:
- Phosphorylation of glucose to form hexose 1-6 bisphosphate in glycolysis.
- Removal of phosphate group from TP in glycolysis.
- Removal of phosphate group from intermediate in Krebs Cycle.
- Formation of substrate level phosphorylation.
NAD:
- Oxidation (removal of) H/electrons from triose bisphosphate in glycolysis.
- Removal of H/electrons from pyruvate in link reaction.
- Removal of H/electrons from intermediates in Krebs Cycle.
- Addition of electrons to electron transport chain.
- Addition of electrons to pyruvate in lactate fermentation.
- Addition of electrons to ethanal in alcoholic fermentation.
FAD:
- Oxidation/removal of H/removal of electrons from intermediates in Krebs Cycle.
What properties of the mitochondrial inner membrane allow chemiosmosis to occur? -
ANSWER-- Mostly impermeable H+ ions.
- Large surface area.
- Presence of ATP synthase.
Describe two quantitative changes in the inter-membrane space which occur as a result
of oxidative phosphorylation. - ANSWER-- pH decreases.
- Becomes more positively charged.
Explain how having a larger number of proton pores in the inner mitochondrial
membrane would result in a person being less likely to gain weight. - ANSWER-- Larger
number of proton pores results in protons leaking back into the matrix.
- Reduces yield of ATP from chemiosmotic gradients.
- Less ATP is made from oxidative phosphorylation.
- More energy wasted as heat energy from chemiosmosis is decoupled from ATP
synthesis.
- Energy yield from aerobic respiration reduced per molecule of glucose.
- Food not converted to ATP as efficiently.
