Usmle materials 2020

2021-04-07 02:40:49 BEST COLLECTION OF MEDICAL TELEGRAM CHANNELS

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Kaplan USMLE 2020

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Usmle materials Videos & Books 2021


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2021-04-07 02:37:11 Usmle materials 2020 pinned Deleted message Open / Comment

2020-12-15 02:18:20 Answer E (correct answer): The question shows a Michaelis-Menten curve for an enzymatic reaction. Maximum velocity of enzymatic conversion of alcohol to acetaldehyde occurs at an ethanol concentration of about 0.08g/dl. At concentrations above this level, metabolism of ethanol into acetaldehyde will occur at a constant rate. Thus, when the blood alcohol level increases from 0.08 to O.lOg/dL there will be no change in rate of aceta!dehyde formation. Open / Comment

2020-12-15 02:18:19 Open / Comment

2020-12-15 02:18:18 Answer C (correct answer): The graph is a Lineweaver Burk plot for the two enzymes, A and 8. Lineweaver Burk plots are a variant of Michaelis­
Menten saturation curves that make the data linear rather than curved. Open / Comment

2020-12-15 02:18:17 Open / Comment

2020-12-15 02:18:17 Answer B (correct answer): The Michaelis constant, Km, represents how avidly an enzyme binds to substrate. The lower the Km value, the more easily
the enzyme binds substrate. Systems with a low Km rapidly reach Vrnax because the enzyme is highly effective at binding substrate. Conversely,
enzymes with a high Km require large amounts of substrate to reach Vmax. ALDHC has a much lower Km compared to ALDHJ. Thus, ALDHC binds to
substrate with higher affinity. Open / Comment