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2008Quiz3withanswers - C zymogen activation D feedback...

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Chem 361/461 and Bio 366 Quiz 3 INSTRUCTIONS : A) You must use a number two pencil to enter the answers in the scantron . B) Make sure that the I.D. number, name (last and first) and test form (use form A) fields are properly filled. The I.D. number field should contain ten digits - you may choose a variation of your Student’s ID number, SSN or phone number starting with the area code. SELECT THE MOST CORRECT ANSWER FOR EACH MULTIPLE-CHOICE QUESTION 1. If an enzyme follows the induced-fit model, it should A) use metal ion catalysis as for carbonic anhydrase or endonucleases. B) work by covalent catalysis as for chymotrypsin. *C) use a catalytic strategy similar to adenylate kinase where the conformation of the Mg(II)-ATP complex is distorted to resemble the transition state. D) involve a thiol-bound substrate as in cysteine proteases. E) have more than one subunit. 2. Phosphorylation that changes an enzyme’s activity is an example of *A) covalent modification. B) allosteric regulation.
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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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