Unformatted text preview: 12 A protein has been isolated from nerve tissue and not found to exhibit anyholegical‘activity. Howeve
proteolytic enzyme trypsin is discovered to act on this protein, hydrolyze a peptide bond, with the result that the protein will now catalyze the methylation of certam neurotransmitters The original piotein is an
example of: V’ a) a hysteretic protein.
b) an isoenzyme. c) an abortive protein.
-; a homotropic protein @1‘ zymogen. 1 13. An enzyme is found to exist iance ofthe substrate. Which ofthe
following must be true in the Monod—Wyman-Changeaux model for cooperativity? ' The substrate binds equally well to both conformational forms.
@The substrate binds tighter to the least conformational form. c) The substrate binds tighter to the more prevalent conformational form. d) The substrate will bind after an effector molecule binds. e) The substrate induces a conformational change. /% -14. Which of the following vitamins produces a coenzyme tMWanbea—cbemimy? 90m acid
c) thiamin d) riboﬂavin: 1
e) lipoic acid 15. Which ofthe vitamins li ed in - - . - : : . e we is used In hydroxylation reactions? ehuamgtwtwm W3 16. Which ofthe following is true of ATP? ﬂCytosolic levels of ATP are always lower WP, but the reverse is true inside the mitochondria.
1)) ATP concentration in muscles 15 always greater than creatine or creatine phosphate concentrations he2 AG value for hydrolysis of ATP 15 less negative at lower pH values. (1) g2 binds to ADP tighter than ATP . t
e) All ofthe above are false 1 Ab MOW“ WI “Jr T
[email protected]/hich ofthe following Will form an internal heggt a1? , 31*}?th : .. —_,,
c v eraldehyde l W
(1) riboseK W e) dihydroxyacetone ...
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- Spring '08