A2 BIOLOGY RESPIRATION MODEL EXAM
WITH OBJECTIVE ASSESSMENT ANSWERS
AND EVERTHING YOU NEED TO PASS.
Respiration produces more ATP per molecule of glucose in the presence of
oxygen than it does when oxygen is absent. Explain why. - CorreCt Answers
-oxygen is the terminal electron acceptor for oxidative phosphorylation,
which provides the most ATP. Only glycolysis takes place in anaerobic
respiration.
Give two ways in which anaerobic respiration of glucose in yeast is similar
to anaerobic respiration of glucose in a muscle cell: - CorreCt Answers -1.
ATP formed
2. pyruvate formed
3. glycolysis involved
Give two ways in which anaerobic respiration of glucose in yeast is different
to anaerobic respiration of glucose in a muscle cell: - CorreCt Answers -
ethanol is formed by yeast.
lactate formed by muscle cell.
CO2 released by yeast but not by muscle cell.
Apart from respiration, give three uses of ATP in a liver cell. (3) - CorreCt
Answers -Any three from: source of energy; active transport; phagocytosis;
bile production; mitosis; synthesis of glycogen, protein, DNA, lipids, urea
, Describe what happens to pyruvate in anaerobic conditions and explain
why anaerobic respiration is advantageous to human skeleton muscle (4) -
CorreCt Answers -Forms lactate to regenerate reduced NADH into NAD by
pyruvate molecule accepting hydrogen atom. NAD can be re-used to oxidise
more respiratory substract and allow glycolysis to continue, so energy can
still be releasted when oxygen is in short supply.
ATP is useful in many biological processes. Explain why. (4) - CorreCt
Answers -Releases energy in small manageable amounts. Broken down in
one step, makes energy avaliable rapidly. Phosphorylates substances to
make them more reactive by lowering their activation energy. Can be
reformed.
describe how ATP is made in mitochondria (6) - CorreCt Answers -ATP is
produced in the Krebs cycle;
Krebs cycle/link reaction produces reduced coenzyme;
Electrons are released from reduced coenzymes;
And pass through electron transport chain;
Energy released is used to combine;
ADP + Pi to make ATP
Explain why a person with mitochondrial disease can only exercise for a
short time (2) - CorreCt Answers -Mitochondria use aerobic respiration.
Mitochondria produce ATP required to muscles to contract.
Explain the advantage of mitochondria in muscle cells having more cristae
(2) - CorreCt Answers -More cristae = larger surface area for electron
transport chain and hence ATP production. Muscle cells use more ATP than
skin cells (NOT just more respiration)
WITH OBJECTIVE ASSESSMENT ANSWERS
AND EVERTHING YOU NEED TO PASS.
Respiration produces more ATP per molecule of glucose in the presence of
oxygen than it does when oxygen is absent. Explain why. - CorreCt Answers
-oxygen is the terminal electron acceptor for oxidative phosphorylation,
which provides the most ATP. Only glycolysis takes place in anaerobic
respiration.
Give two ways in which anaerobic respiration of glucose in yeast is similar
to anaerobic respiration of glucose in a muscle cell: - CorreCt Answers -1.
ATP formed
2. pyruvate formed
3. glycolysis involved
Give two ways in which anaerobic respiration of glucose in yeast is different
to anaerobic respiration of glucose in a muscle cell: - CorreCt Answers -
ethanol is formed by yeast.
lactate formed by muscle cell.
CO2 released by yeast but not by muscle cell.
Apart from respiration, give three uses of ATP in a liver cell. (3) - CorreCt
Answers -Any three from: source of energy; active transport; phagocytosis;
bile production; mitosis; synthesis of glycogen, protein, DNA, lipids, urea
, Describe what happens to pyruvate in anaerobic conditions and explain
why anaerobic respiration is advantageous to human skeleton muscle (4) -
CorreCt Answers -Forms lactate to regenerate reduced NADH into NAD by
pyruvate molecule accepting hydrogen atom. NAD can be re-used to oxidise
more respiratory substract and allow glycolysis to continue, so energy can
still be releasted when oxygen is in short supply.
ATP is useful in many biological processes. Explain why. (4) - CorreCt
Answers -Releases energy in small manageable amounts. Broken down in
one step, makes energy avaliable rapidly. Phosphorylates substances to
make them more reactive by lowering their activation energy. Can be
reformed.
describe how ATP is made in mitochondria (6) - CorreCt Answers -ATP is
produced in the Krebs cycle;
Krebs cycle/link reaction produces reduced coenzyme;
Electrons are released from reduced coenzymes;
And pass through electron transport chain;
Energy released is used to combine;
ADP + Pi to make ATP
Explain why a person with mitochondrial disease can only exercise for a
short time (2) - CorreCt Answers -Mitochondria use aerobic respiration.
Mitochondria produce ATP required to muscles to contract.
Explain the advantage of mitochondria in muscle cells having more cristae
(2) - CorreCt Answers -More cristae = larger surface area for electron
transport chain and hence ATP production. Muscle cells use more ATP than
skin cells (NOT just more respiration)
