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Standard XII
Biology
Cellular Respiration
Is ATP synthe...
Question
Is ATP synthetase a protein?
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Solution
ATP synthetase:
ATP synthetase is an enzyme that catalyzes the reaction of ATP synthesis.
ATP ( adenosine triphosphate) is the energy source of the cell.
ATP synthetase enzyme catalyzes the reaction of ATP formation from ADP and also the reverse of this reaction.
In cristae in mitochondria, a knob-like structure is found.
This is a phosphorylation complex that is called F
0
F
1
ATP synthetase.
This complex has two main components head part F
1
and a basal part called F
0.
The head part is a peripheral membrane protein complex. It has a catalytic site for converting ADP into ATP and ATP into ADP.
The basal part is an integral membrane protein complex. It contains many copies of 3 different types of polypeptides.
This forms a membrane channel for protons.
So, ATP synthetase is a protein.
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Assertion :Oxidative phosphorylation is the synthesis of energy rich ATP. Reason: The enzyme required for ATP synthesis is called ATP synthetase.
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Assertion :The stromal thylakoids are rich in ATP synthetase Reason: The granal membranes are rich in ATP synthetase
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ATP synthetase of chloroplasts is similar to that of
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Assertion:
The stromal thylakoids are rich in both PS I and PS II.
Reason:
The granal membranes are rich in ATP synthetase.
Q.
The following (P through U) are the main steps of chemosynthetic ATP synthesis in the light reaction. Which places them in correct order?
P.
H
+
concentration gradient established
Q.
H
+
diffuses through ATP synthetase
R. Carriers use energy from electrons to move
H
+
across the membrane
S. Electrons from PSII pass along electron transport chain
T. Light excites electrons in PSII
U. Energy of
H
+
flow is used by ATP synthetase to make ATP.
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