1) Which of the following is true of the ATP Synthase in the mitochondria? It is
ID: 218510 • Letter: 1
Question
1) Which of the following is true of the ATP Synthase in the mitochondria?
It is an enzyme.
It can catalyze either phosphorylation of ADP or dephosphorylation of ATP.
It is a proton transporter.
All of the above
2) The enzymatic activity of ATP Synthase (F1) in mitochondria results directly from:
Rotation
ATP hydrolysis by F0
The decrease in pH resulting from H+ flux
The H2O produced at the end of the electron transport system
3) Why is the activity of Phosphofructokinase (PFK-1) high at moderate concentrations of ATP and low at high concentrations of ATP?
When there is a lot of ATP, it gets consumed more rapidly in other processes, which decreases the ability of PFK-1 to use it.
ATP is a competitive inhibitor of PFK-1.
At high concentrations ATP is an allosteric inhibitor of PFK-1.
ATP phosphorylates PFK-1, inactivating it.
4) The major carbohydrate-derived reactant of fermentation is ____; and during fermentation this compound is _____.
Lactate; oxidized
Ethanol; oxidized
Pyruvate; reduced
Citric acid; reduced
5) Which of the following statements is NOT true regarding our relationship to photosynthesis?
For glycolysis to proceed in the absence of O2, NADH must be reoxidized to NAD+. This takes place during photosynthesis.
Aerobic respiration requires O2, which is produced during photosynthesis.
Most photosynthetic organisms fix CO2 reducing it to form sugars that we rely on for our source of energy and carbon.
None of the above (i.e. all of the above are true.)
It is an enzyme.
It can catalyze either phosphorylation of ADP or dephosphorylation of ATP.
It is a proton transporter.
All of the above
2) The enzymatic activity of ATP Synthase (F1) in mitochondria results directly from:
Rotation
ATP hydrolysis by F0
The decrease in pH resulting from H+ flux
The H2O produced at the end of the electron transport system
3) Why is the activity of Phosphofructokinase (PFK-1) high at moderate concentrations of ATP and low at high concentrations of ATP?
When there is a lot of ATP, it gets consumed more rapidly in other processes, which decreases the ability of PFK-1 to use it.
ATP is a competitive inhibitor of PFK-1.
At high concentrations ATP is an allosteric inhibitor of PFK-1.
ATP phosphorylates PFK-1, inactivating it.
4) The major carbohydrate-derived reactant of fermentation is ____; and during fermentation this compound is _____.
Lactate; oxidized
Ethanol; oxidized
Pyruvate; reduced
Citric acid; reduced
5) Which of the following statements is NOT true regarding our relationship to photosynthesis?
For glycolysis to proceed in the absence of O2, NADH must be reoxidized to NAD+. This takes place during photosynthesis.
Aerobic respiration requires O2, which is produced during photosynthesis.
Most photosynthetic organisms fix CO2 reducing it to form sugars that we rely on for our source of energy and carbon.
None of the above (i.e. all of the above are true.)
Explanation / Answer
1) Which of the following is true of the ATP Synthase in the mitochondria?
D) All of the above
2) The enzymatic activity of ATP Synthase (F1) in mitochondria results directly from:
C) The decrease in pH resulting from H+ flux
3) Why is the activity of Phosphofructokinase (PFK-1) high at moderate concentrations of ATP and low at high concentrations of ATP?
C) At high concentrations ATP is an allosteric inhibitor of PFK-1.
4) The major carbohydrate-derived reactant of fermentation is ____; and during fermentation this compound is _____.
C) Pyruvate; reduced
5) Which of the following statements is NOT true regarding our relationship to photosynthesis?
A) For glycolysis to proceed in the absence of O2, NADH must be reoxidized to NAD+. This takes place during photosynthesis.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.