BioChemistry > EXAM > HMX biochemistry practice exam 2022| 163 questions| with complete solutions (All)

HMX biochemistry practice exam 2022| 163 questions| with complete solutions

Document Content and Description Below

energy needed to get a reaction started Correct Answer: activation energy respresented in a reaction coordinate diagram. Positive is thermodynamically unfavorable. Negative is thermodynamically favorable (exergonic - release energy). = G(products) - G(reactants) Correct Answer: Delta G (change in G - change in free energy) catalyze chemical reaction. Lower activation energy. Biological catalyst (protein) Correct Answer: enzyme results in decrease in activity of that enzyme, reaising activation enregy of reaction it catalyzes Correct Answer: enzyme inhibition results in increase in activity of that enzyme, lowering activation energy of reaction it catalyzes Correct Answer: enzyme activation when rate of forward and reverse reactions are same. Concentration of products and reactants don't change appreciably over time but reaction is going. On average, same # of A + B reactions and C splitting reactions occurring a given period of time Correct Answer: equilibrium property of a molecule that reflects its capacity to do work. Determined by potential energy stored in chemical bonds and concentration/physical parameters (temperature) Correct Answer: Gibbs' Free Energy (G) central pathway in breakdown of carbs for energy. Series of 10 reactions. 1 glucose --> 2 pyruvate. - change in G of whole pathway but some reactions have positive change in G. Net formation of 2 ATP and 2 NADH for each glucose Correct Answer: glycolysis one molecule is transformed into another molecule which has exactly the same atoms, but atoms have a different arrangement. ABC --> BAC. Chemical formula doesn't change but atoms are rearranged. Correct Answer: isomerization enzymes that catalyze reactions in which a molecule is phosphorylated. Ex. Hexokinase catalyzes the phosphorylation of glucose. Phosphofructokinase 1 (PFK-1) catalyzes phosphorylation of phosphofructose (Fructose 6-phosphate) Correct Answer: Kinase when a system is initially at equilibrium, then perturbed away from equilibrium, it will counteract the perturbation to move back towards equilibrium (change in G not equal to 0), either forward or reverse reaction is more thermodynamically favorable. Low activation energy Correct Answer: Le Chatelier's principle results of some process serve to counteract that process. maintains a variable in a narrow range at homeostasis. Correct Answer: negative feed

[Show More]

Last updated: 3 years ago

Preview 1 out of 13 pages

Buy Now

Instant download