7, In the carbon assimilation \"dark\") reactions of photosynthesis,the biosymbh
ID: 218061 • Letter: 7
Question
7, In the carbon assimilation "dark") reactions of photosynthesis,the biosymbhesis of 1 mol ofheofrom dioxide requires: mol of carbon A) 12 mol of NADPH and 12 mol of ATIP 12 mol of NADPH and 18 mol of ATP. 18 mol of NADPH and 12 mol of ATP. 18 mol of NADPH and 18 mol of ATP. 2 B) 2. C) D) E) no NADPH and 12 mol of ATF 8. Which of the following is the most correct statement? A) The glycolate pathway converts two molecules of 2-phosphoglycolate to a molecule of serine and a molecule of Co B) 2-phosphoglycolate and 3-phosphoglycerate are the products of the oxygenase activity of Rubisco CT Parts of the glycolate pathway occur in the chloroplast, peroxisome and mitochondria D) One reason that photorespiration occurs is that Rubisco has both a carboxy lase and an oxygenase activity E) All of the above are true 9. C4 plants A) prevent photorespiration by having the RUBISCO reaction occur in the bundle-sheath cells isolated from the Oj rich atmosphere by the mesophyll cell B) combine CO2 from the air (HCO3. inside the cell) with oxaloacetate to form phosphoenolpyruvate C) Use plasmodesmata to block movement between mesophyll cells and bundle-sheath cells D) carry out the Calvin cycle in the mesophyll cells E) All of the above 10. Which of the following is not required in the synthesis of fatty acids? A) Acetyl-CoA B)Biotin C)HCO," (CO) D?MalonylCOA E)NADH 11. The rate-limiting step in fatty acid synthesis is: )condensation of acetyl-CoA and malonyl-CoA. ,B) formation of malonyl-CoA from acetyl CoA and HCO, O formation of malonyl-CoA from malonate and coenzyme A. D) formation of acetyl-CoA from acetate E) the reduction of the acetoacetyl group to a ß-hydroxybutyryl group. 12. Which of the following is not true of the reaction producing malonyl-CoA for faty acid synthesis? A) It is stimulated by citrate. It requires biotin carrier protein C) It requires CO(or bicarbonate). D) One mole of ATP is converted to ADP+P, for each malony-CoA synthesized. E) It occurs in the matrix of themitochondria 13. Which of these can be synthesized by plants but not by humans? A) Linoleate [18:2(2) B) Palmitate (16:0) C) Phosphatidylcholine D) Pyruvate E) Stearate (18:0) 7 14. Fats are required in our diets because A) We are unable to synthesize any fat By We are only able to derive energy from fat molecules C) Dietary fats provide the linoleate and linolenate that we need but cannot D) both A and C are correct none of the above.Explanation / Answer
Q.7 Answer is A- 12 molecules of ATP and 12 molecules of NADPH.
12 ATP are utilized during conversion of 3phosphoglycerate to 1,3- biphosphoglycerate in presence of enzyme 3 phosphoglycerate kinase.
!2 NADPH are utilized during conversion of 1,3 biphosphoglycerate to 3 phosphoglyceraldehyde in presence of enzyme NADP glyceraldehyde-3-phosphate dehydrogenase.
Q.8 Answer is E- All of the above statements are true. During glycolatic pathway 2 molecules of Phosphoglycerate are converted into serine and Co2 . In the mitochondria 2molecules of glycine (derived from initial moleule phosphoglycerate) are converted into 1 molecule of serine and 1 molecule of Co2 is released. Out of 4 carbon 1 carbon is lost in mitochondria.
Q.9 Answer is A- C4 plants prevent photorespiration by having RUBISCO reaction occur in bundle sheath cell isolated from O2 rich atmosphere by the mesophyll cells.
All the other options are wrong.Because CO2 and phosphoenol pyruvate inside mesphyll cell give rise to OAA. Calvin cycle occurs in bundle sheath cell. Malic acid formed in mesophyll cell is transported through plasmodesmata to bundle sheath cell.
Q.10 Answer is C. HCO3 - (CO2 ) is not required for fatty acid synthesis. Acetyl CoA & NADP are prerequisites for for fatty acid synthesis. Acetyl CoA is carboxylated to malonyl CoA by acetyl CoA carboxylase which require ATPand BIOTIN for the process.
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