Biochemistry 451 Exam 1 Past Questions With Guaranteed Correct Answers Graded A+

With respect to decarboxylation of pyruvate: a. it can work non-oxidatively in yeast b. FADH2 and NADH are required c. lipoamide is required for reduction of acetaldehyde d. it produces acetyl-CoA when there is no NAD+ e. all of the above are true d. none of the above are true - correct answers a. it can work non oxidatively in yeast With respect to fermentation in yeast: a. acetaldehyde gets oxidized b. NAD+ is used making ethanol c. NADH is produced in making ethanol d. all of the above are true e. none of the above are true - correct answers e. none of the above are true With respect to the Citric Acid Cycle: a. it can produce and use CO2 in the forward direction b. it occurs in the mitochondrion c. each turn of the cycle directly produces one GDP d. all of the above are true e. none of the above are true - correct answers b. it occurs in the mitochondrion With respect to the second decarboxylation of the citric acid cycle: a. it produces NAD+ b. it is oxidative in all organisms c. it is catalyzed by isocitrate dehydrogenase d. all of the above are true e. none of the above are true - correct answers b. it is oxidative in all organisms With respect to the enzymes of the citric acid cycle: a. citrate synthase catalyzes an oxidation that is energetically favorable b. isocitrate dehydrogenase requires 5 coenzymes c. citrate synthase catalyzes conversion of citrate to isocitrate d. they are mostly activated when NADH is abundant e. all of the above are true f. none of the above are true - correct answers a. citrate synthase catalyzes an oxidation that is energetically favorable With respect to the glyoxylate cycle: a. it is not a means of making glucose in plants b. it uses the enzyme aconitase c. it involves only one decarboxylation d. all of the above are true e. none of the above are true - correct answers b. it uses the enzyme aconite With respect to fatty acids: a. they are found in phosphatides, fats, and sphingolipids b. they can be unsaturated even if they contain only one double bond c. they are mostly non-polar d. all of the above are true e. none of the above are true - correct answers d. all of the above are true With respect to lipids in membranes: a. they include sphingolipids, glycerophospholipids and cholesterol b. they can contain saturated and unsaturated fatty acids c. they do not all contain fatty acids d. all of the above are true e. none of the above are true - correct answers d. all of the above are true With respect to membrane transport: a. diffusion driven transport requires no external energy b. active transport always moves at least one molecule with a concentration gradient c. ARP is the only source of energy for active transport d. all of the above are true e. none of the above are true - correct answers a. diffusion driven transport requires no external energy Prostaglandins: a. are made by enzymes known as cyclooxygenases (COX enzymes) b. are derived from linolenic acid c. are favored for syntheses by treatment with NSAIDs, such as aspirin or ibuprofen d. all of the above are true e. none of the above are true - correct answers a. are made by enzymes known as cyclooxygenases With respect to the lactose permeate: a. it uses energy from a proton gradient b. it is a symport c. it is electrogenic d. all of the above are true e. none of the above are true - correct answers d. all of the above are true At the start of nerve transmission, a. potassium gates open to attempt to restore the charge imbalance caused by opening of the sodium gates b. the first ions to move are protons c. the second ion to move is sodium d. all of the above are true e. none of the above are true - correct answers a. potassium gates open to attempt to restore the charge imbalance caused by opening of the sodium gates Neurotransmitters: a. travel through sodium and/or potassium gates b. required a proton gradient c. are protons d. all of the above are true e. none of the above are true - correct answers e. none of the above are true With respect to electron transport, which of the following statements is not true? a. electrons enter in pairs and exit singly b. coenzyme Q acts as the traffic cop c. oxygen is not required in the process d. cytochrome C interacts with complex 3 - correct answers c. oxygen is not required in the process With respect to the Q cycle: a. the first pair of electrons splits, one going to cytochrome C and the other to coenzyme Q b. the second pair of electrons splits, one going to cytochrome C and the other to coenzyme Q c. proton pumping occurs during the cycle d. all of the above are true e. none of the above are true - correct answers d. all of the above are true With respect to oxidative phosphorylation, which of the following is not true? a. the process requires ATP b. the process does not have a step involving O2 c. it decreases with treatment with 2.4 dintrophenol d. ATP synthase is located in the mitochondrial inner membrane - correct answers a. the process requires ATP With respect to the structure of ATP synthase: a. the "L" configuration makes ATP b. the "O" configuration makes ATP c. the "T" configuration makes ATP d. all of the above are true e. none of the above are true - correct answers c. the "T" configuration makes ATP When repertory control exists: a. mitochondria are resistant to 2,4 dinitrophenol b. high NAD+ levels tend to favor electron transport c. high ATP levels will stimulate electron transport d. all of the above are true c. none of the above are true - correct answers c. none of the above are true When mitochondria get uncoupled, which of the following is not true: a. oxygen consumption goes up b. temperature increases c. citric acid cycle slows d. temperature increases - correct answers c. citric acid cycle slows With respect to glycerolized metabolism: a. phosphatidic acid is a precursor of sphingolipid compounds b. glycerolipids typically contain a saturated fatty acid at position #2 c. it does not use palmitoyl-CoA and serine as precursors d. all of the above are true e. none of the above are true - correct answers c. it does not use palmitoyl-CoA and serine as precursors With respect to metabolites made from cholesterol: a. estrogens are derived from androgens b. it includes vitamin D, but not vitamin A c. it includes all of the steroid hormones d. all of the above are true e. none of the above are true - correct answers d. all of the above are true With respect to NADH: a. it cannot move across the mitochondrial outer membrane b. it is needed for the citric acid cycle to function c. it binds to the ATP synthase to provide the protons d. all of the above are true e. none of the above are true - correct answers e. none of the above are true With respect to cholesterol biosynthesis: a. it uses 5 carbon building blocks known as isoperenes b. squalene is not a cyclic intermediate c. it is regulated allosterically d. all of the above are true e. none of the above are true - correct answers d. all of the above are true With respect to superoxide dismutase: a. it produces superoxide b. it uses ozone c. it uses oxidized molecular oxygen d. all of the above are true e. none of the above are true - correct answers e. none of the above are true With respect to glycerophospholipid metabolism: a. phosphatidic acid contains two fatty acids b. triacylglycerol lipase does not work on them c. CDP is found in activated intermediates in their metabolsim d. all of the above are true of the above are tru