amswer 96 &97 Given the following series of metabolic reactions: acetyl CoA & ox

Question

amswer 96 &97

Given the following series of metabolic reactions: acetyl CoA & oxaloacetic acid rightarrow citric acid rightarrow isocitric acid rightarrow oxalosuccinic acid Enzyme 1 is classified as what type of enzyme? A) ligases B) lyases C) transferases D) isomerases E) oxidoreductases Enzyme 1 has regulatory sites for NAD, ATP and NADH. Which would deactivate the enzyme? A) NAD B) ATP C) NADH D) ATP and NAD E) ATP and NADH What type of enzyme is E_3? A) ligases B) lyases C) transferases D) isomerases E) oxidoreductases What is the high energy bond in acetyl-CoA A) a regular ester B) a thio ester C) a phosphate ester D) a thioalcohol Which can produces the most ATP per glucose molecule? A) glucose metabolism in a muscle cell under anaerobic conditions B) glucose metabolism in a red blood cell under any conditions C) glucose metabolism in the muscle under aerobic conditions D) fermentation In aerobic exercise, the pH of the muscles will A) increase B) decrease C) remain the same D) depends on the temp Why are there so many steps in the metabolic pathways? A) to prevent the rapid release of energy B) to save some of the energy as ATP C) to have control spots to regulate metabolism D all are true E) A and B What is the purpose of the Cori cycle? A) move pyruvic acid from the muscle B) move lactic acid out of the muscle to the liver C) have the liver provide the muscle with "new glucose" D) all are true E) B & C In the conversion of pyruvic acid to acetyl CoA, what enzymes are needed? A) dehydrogenase B) decarboxylase C) synthetase D) all are true E) A and B In times of starvation, which can be converted into glucose? A) all amino acids B) glycerol C) ketone bodies D) all are true E) A and B If there is no oxygen present, which processes can still occur? A) Krebs cycle B) electron transport C) glycolysis D) all are true E) no answer is correct Which is true of ketone bodies? A) Since 2 out of 3 ketone bodies are acids, they can lead to acidosis B) Synthesized by all cells C) synthesized by the liver D) all are true E) A & C

Explanation / Answer

Answer 96: E option i.e. A and B is true because

Many enzymes in series result in complex transformation,Energy released at a small step can be captured efficiently Cells mainly use one type of energy packet (ATP) to fuel any small step

Answer 97.E option i.e. B and C is true :

Summarizing,part of the lactate produced in skeletal muscle is converted to glucose in the liver, and transported back to skeletal muscle, thus closing the cycle.

Glucose Lactate Glucose

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