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Unformatted text preview: C) zymogen activation. D) feedback inhibition. E) isozyme regulation. 3. An aldehyde and an alcohol react to form a(n) A) ketal B) aketal C) acetal D) hemiketal *E) hemiacetal 4. The major forms of lipids in biological membranes are A) phospholipids and glycolipids. B) cholesterol. C) phosphatidates, triglycerides and fatty acids. *D) answers A and B. E) all of the above. 5. Why is the sodium channel specific for sodium and not for potassium ions? A) The diameter of the sodium ion alone is the determining factor in channel selectivity. B) The size of the hydrated sodium ion relative to the pore size is the determining factor in channel selectivity. *C) Dehydration of the sodium ion is compensated energetically by interactions with oxygen atoms in the selectivity filter, which is not possible with potassium ions. D) ATP hydrolysis occurs only when sodium, but not potassium, ions are transported by the channel. E) all of the sbove....
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- Spring '08