1) What is the primary purpose of fermentation? Re-oxidation of NADH Formation o
ID: 219121 • Letter: 1
Question
1) What is the primary purpose of fermentation?
Re-oxidation of NADH
Formation of ATP
Production of ethanol or lactic acid
Reduction of NAD+
Both re-oxidation of NADH and formation of ATP
2) Why is it so important to regulate the activity of an enzyme like Phosphofructokinase (PFK-1)?
Because it catalyzes the first reaction in its pathway.
Because it consumes ATP, which is a valuable resource for the cell.
Because the reaction catalyzed by PFK-1 is irreversible, so the reactants cannot be regenerated if they are needed simply by reversing the reaction.
All of the above
3) How are the Light-dependent reactions of photosynthesis similar to the electron transport system in aerobic metabolism?
They both involve generation of a proton gradient that is harnessed to produce ATP.
Reduced coenzymes donate their electrons to the electron transport system, which harnesses the energy to produce a proton gradient.
They both use O2 as the final electron acceptor.
All of the above.
4) Which of the following DOES NOT occur during the light-dependent reactions of photosynthesis?
ATP synthesis
Oxidation of water
Carbon fixation
Electron transport
5) Oxidation of NADH and FADH2 in the electron transport system are similar in that:
Both give their electrons to Complex I, but after that the paths if their electrons diverge.
Both give their electrons directly to Ubiquinone (CoQ).
Both require Ubiquinone, Complex III, Cytochrome C, and Complex IV, ultimately resulting in reduction of O2
Both result in pumping of H+ from the intermembrane space to the mitochondrial matrix.
Explanation / Answer
ANSWER 1)
Re-oxidation of NADH - this is because the NAD+ that is generated has a Hydrogen removed from it, and the process of removal of Hydrogen is called oxidation.
ANSWER 2)
Because the reaction catalyzed by PFK-1 is irreversible, so the reactants cannot be regenerated if they are needed simply by reversing the reaction.
ANSWER 3)
They both involve generation of a proton gradient that is harnessed to produce ATP
ANSWER 4)
Carbon fixation - this is because it is a part of the dark phase
ANSWER 5)
Both give their electrons directly to Ubiquinone (CoQ)
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