Chapter 20 Testbank

Chapter 20 Testbank - Chapter 20 Carbohydrate Biosynthesis...

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Chapter 20 Carbohydrate Biosynthesis in Plants and Bacteria Multiple Choice Questions 1. Photosynthetic carbohydrate synthesis Page: 775 Difficulty: 1 Ans: C The compound that condenses with CO 2 in the first reaction of carbon dioxide assimilation is: A) 3-phosphoglycerate. B) ribose 1,5-bisphosphate. C) ribulose 1,5-bisphosphate. D) ribulose 5-phosphate. E) rubisco. 2. Photosynthetic carbohydrate synthesis Pages: 779-780 Difficulty: 2 Ans: C Which of these enzymes is not part of the Calvin cycle? A) Aldolase B) Glyceraldehyde 3-phosphate dehydrogenase C) Phosphofructokinase-1 D) Ribulose-5-phosphate kinase E) Transketolase 3. Photosynthetic carbohydrate synthesis Pages: 780-781 Difficulty: 2 Ans: E Transketolase requires the coenzyme: A) cobalamin (vitamin B 12 ). B) lipoic acid. C) pyridoxal phosphate. D) tetrahydrofolic acid. E) thiamine pyrophosphate. 4. Photosynthetic carbohydrate synthesis Page: 780 Difficulty: 2 Ans: D When transketolase acts on fructose 6-phosphate and glyceraldehyde 3-phosphate, the products are: A) 3-phosphoglycerate and glyceraldehyde 3-phosphate. B) 3-phosphoglycerate and two molecules of glyceraldehyde 3-phosphate. C) dihydroxyacetone phosphate and glucose 6-phosphate. D) xylulose 5-phosphate and erythrose 4-phosphate. E) xylulose 5-phosphate and ribose 5-phosphate.
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Carbohydrate Biosynthesis in Plants and Bacteria 5. Photosynthetic carbohydrate synthesis Page: 782 Difficulty: 1 Ans: C Which of these compounds is not directly involved in the Calvin cycle? A) Erythrose 4-phosphate B) Glyceraldehyde 3-phosphate C) Mannose 6-phosphate D) Ribulose 5-phosphate E) Sedoheptulose 7-phosphate 6. Photosynthetic carbohydrate synthesis Page: 782 Difficulty: 2 Ans: B In the carbon assimilation (“dark”) reactions of photosynthesis, the biosynthesis of 1 mol of hexose from 6 mol of carbon dioxide requires: A) 12 mol of NADPH and 12 mol of ATP. B) 12 mol of NADPH and 18 mol of ATP. C) 18 mol of NADPH and 12 mol of ATP. D) 18 mol of NADPH and 18 mol of ATP. E) no NADPH and 12 mol of ATP. 7. Photosynthetic carbohydrate synthesis Pages: 784, 789 Difficulty: 3 Ans: C The known mechanisms of activation of rubisco or of other enzymes of the Calvin cycle during illumination include all of the following except: A) increased stromal pH. B) light-driven entry of Mg 2+ into the stroma. C) phosphorylation by cAMP-dependent protein kinase. D) phosphorylation of phosphoenolpyruvate carboxylase. E) reduction of a disulfide bridge by thioredoxin. 8. Photosynthetic carbohydrate synthesis Pages: 784-785 Difficulty: 3 Ans: E Which of these chloroplast enzymes is not regulated by light? A) Fructose 1,6-bisphosphatase B) Glyceraldehyde-phosphate dehydrogenase C) Ribulose 5-phosphate kinase D) Sedoheptulose 1,7-bisphosphatase E) All of the above are regulated by light. 9.
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Chapter 20 Testbank - Chapter 20 Carbohydrate Biosynthesis...

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