The scientist who proposed the 'chemiosmotic hypothesis' for ATP synthesis was:
A. Fritz Lipmann
B. Peter Mitchell
C. Hans Krebs
D. Melvin Calvin
Answer: Option B
Solution (By JKExamLibrary)
Peter Mitchell proposed the chemiosmotic theory (1961), explaining that a proton gradient across a membrane drives ATP synthesis. Krebs discovered the citric acid cycle, Calvin the Calvin cycle, Lipmann discovered coenzyme A.
Explanation:
The choroid plexus, a network of ependymal cells and capillaries in the ventricles of the brain, continuously produces CSF by filtration and secretion. CSF circulates through ventricles and the subarachnoid space and is reabsorbed by arachnoid villi into the venous system. Dura mater is the outer protective membrane.
Explanation:
Frederick Sanger determined the amino acid sequence of insulin in 1955, showing proteins have a specific sequence. Banting and Best isolated insulin, Hodgkin determined its 3D structure.
Explanation:
The SA node, located in the right atrium, spontaneously generates electrical impulses, setting the heart rate. It is the natural pacemaker. The AV node delays the impulse before it reaches the ventricles.
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