40. Which tautomeric form of ribose predominates in solution? (A) $\alpha$-pyranose (B) $\beta$-pyranose (C) $\alpha$-furanose (D) $\beta$-furanose (E) all of the above.

4. Which of the following descriptions about the Michaelis-Menten rate equation is incorrect ? (A) KM measures the substrate concentration at which the reaction rate is Vmax/2 (B) kcat is the turnover number that measures the rate of the catalytic process (C) The ratio kcat/KM is a convenient measure of enzyme efficiency (D) kcat = Vmax/[Enz] (E) A competitive inhibitor decreases the apparent KM.

40. Which tautomeric form of ribose predominates in solution?
(A) $\alpha$-pyranose
(B) $\beta$-pyranose
(C) $\alpha$-furanose
(D) $\beta$-furanose
(E) all of the above.

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