A. Incorrect! No, this statement is accurate so is not the correct selection to the question.

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1 Biochemistry - Problem Drill 14: Glycolysis No. 1 of Which of the following statements is incorrect with respect to glycolysis? (A) It is the conversion of glucose to pyruvate. (B) In glycolysis no energy is generated. (C) Glycolysis converts glucose to energy. (D) Intermediates of glycolysis include fructose and galactose. (E) Glycolysis is found in both aerobic and anaerobic organisms. No, this statement is accurate so is not the correct selection to the question. B. Correct! Yes, this statement is wrong so is the correct selection. No, this statement is accurate so is not the correct selection to the question. No, this statement is accurate so is not the correct selection to the question. No, this statement is accurate so is not the correct selection to the question. In glycolysis ATP is generated. Therefore this statement is inaccurate. The correct answer is (B).

2 No. 2 of Which of the following statements is incorrect with respect to the molecule shown below? (A) This molecule contains an aldehyde group. (B) This is an aldohexose. (C) This molecule can also exist as an open chain. (D) The conversion between the open chain and ring structure involves the aldehyde carbon atom. (E) This is a non-reducing sugar. No, this statement is correct so this is not the proper selection. B. Incorrect No, this statement is correct so this is not the proper selection. No, this statement is correct so this is not the proper selection. No, this statement is correct so this is not the proper selection. E. Correct! Yes, This molecule is glucose which is a reducing sugar. This molecule is glucose which is a reducing sugar. The correct answer is (E).

3 No. 3 of The molecule shown below is best characterized by which statement? (A) This is the structure of adenosine triphosphates. (B) ATP is produced during glycolysis. (C) ATP is used during cell division. (D) ATP is used in DNA replication as a nucleotide. (E) All of the above No, this statement is correct so this is not the best selection. No, this statement is correct so this is not the best selection. No, this statement is correct so this is not the best selection. No, this statement is correct so this is not the best selection. E. Correct! Yes, this is the best answer to the question. All of the statements are correct and so the best answer is all of the above. The correct answer is (E).

4 No. 4 of With respect to the molecule shown identify the segment labeled A and choose the best response. (A) diphosphate (B) pyrophosphate (C) ADP (D) adenine (E) None of the above No, this is not the best response for this part of the molecule. B. Correct! Yes, this segment of the ADP molecule is the pyrophosphate group. No, the entire molecule is ADP. No, the segment designated by the B is adenine. No, one of the answers presented is correct. The correct answer is (B).

5 No. 5 of Which statement is incorrect with respect to the electron transport chain (ECT)? (A) The ECT couples reactions between electron donors and acceptors. (B) The purpose of the ECT is to create an H + ion gradient across a membrane. (C) ECT takes place only in the mitochondria. (D) H + ions are used to produce ATP. (E) The difference in potential across the membrane provides the energy for ATP formation. C. Correct! Yes, this statement is inaccurate chloroplasts are another site of electron transport chains. ECT occurs in the mitochondria, and chloroplasts for the production of energy. The correct answer is (C).

6 No. 6 of Summary of glycolysis. Complete the chemical equation that summarizes the glycolysis reaction shown here: (A) pyruvate+ NADH+ H + + ATP+ H 2 O (B) 2pyruvate+2NADH+ H + +2ATP+ H 2 O (C) pyruvate+2nadh+2h + +2ATP+2H 2 O (D) 2pyruvate+2NADH+2H + +2ATP+2H 2 O (E) None of the above No, this statement is not correct. No, this statement is not correct. No, this statement is not correct. D. Correct! Yes, the correct summary of the glycolytic pathway is: 2pyruvate+2NADH+2H + +2ATP+2H 2 O No, there is a correct answer listed. The correct answer is (D).

7 No. 7 of The fate of pyruvate generated in glycolysis depends on whether it is metabolized on anaerobic versus aerobic conditions. With that in mind which of the following statements is incorrect? (A) Under aerobic conditions pyruvate enters the TCA cycle. (B) Under aerobic conditions pyruvate enters the citric acid cycle. (C) Under aerobic conditions pyruvate is hydrolyzed to water. (D) Under anaerobic conditions pyruvate forms Lactic acid. (E) Under anaerobic conditions pyruvate can form alcohol. C. Correct! Yes, this statement is in error. Under aerobic conditions pyruvate is oxidized to CO 2 and H 2 O. Under aerobic conditions pyruvate is oxidized to CO 2 and H 2 O. The correct answer is (C).

8 No. 8 of Which of the following statements with respect to the molecule shown is incorrect? (A) This is a branched polymer of glucose. (B) The main branch units are connected in alpha (1:4) linkages. (C) Branching is at every 7-20 residues. (D) The linkages at the branches are alpha (1:4). (E) Main storage polysaccharide in liver and muscle. D. Correct! Yes, Alpha (1:6) linkages occur at the branch sites. The correct answer is (D).

9 No. 9 of Regulation of the glycolytic pathway occurs via.. (A) Enzymes (B) At the first committed step. (C) Regulated at various intermediates for example dihydroxyacetone phosphate. (D) The free energy difference between products and reactants. (E) All of the above E. Correct! Yes, this is the best answer to the question. All of these statements are correct with respect to regulation of glycolysis. The correct answer is (E).

10 No. 10 of Which statement is best with respect to glucose-6-phosphate? (A) First step in glycolysis from glucose to glucose-6-phosphate. (B) Glucose-6-phosphate feedback inhibits phosphorylation of glucose. (C) Hexokinases are responsible for the phosphorylation of glucose to glucose-6-phosphate. (D) Glucose-6-phasphate is rearranged to form fructose-6-phosphate. (E) All of the above statements are correct. E. Correct! Yes, this is the best answer to the question. All of the statements are correct, so E is the best answer. The correct answer is (E).

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