carry out photosynthesis, plant cells still use their mitochondria for 13. Even

Question

carry out photosynthesis, plant cells still use their mitochondria for 13. Even though plants oxidation of pyruvate. When and where will this occurs concurrently c cells in the light, while photosynthesis B. in non-photosynthesizing cells only C. in cells that are storing glucose only all the time D. in photosynthesizing cells and in other tissues tissues in the dark E. in photosynthesizing cells in the light and in other 14. molecule of NAD (nicotinamide adenine dinucleotide) gains a hydrogen atom en a (not a hydrogen ion), the molecule becomes A. hydrogenated and oxidized B. oxidized since it is not reduced C. reduced because it accepts a hydrogen atom. D. redoxed where it is both oxidized and reduced E. a reducing agent because it accepts a hydrogen atom. 15. A chemical reaction will always be spontaneous under which conditions? in entropy A. Exothermic with an increase in entropy B. Exothermic with a decrease Endothermic with a decrease in entropy D. Endothermic with an increase in entropy 16. Assume a thylakoid membrane is somehow punctured so that the interior of the thylakoid is no longer from the stroma. This damage will have the most direct effect on which of the following processes? absorption of light energy by chlorophyll A. the splitting of water B. the D. the reduction of NADP c, the synthesis of ATP E. the flow of electrons from photosystem II to photosystem I 17. The free energy for the oxidation of glucose to Co2 and water is -686 kcal/mole and the free energy for the reduction of NAD NADH is +53 kcal/mole. Why are only two molecules of NADH formed during glycolysis when it appears that as many as a dozen could be formed? used in the A. Most of the free energy available from the oxidation of glucose is production of ATP in glycolysis B. is a very inefficient reaction, with much of the energy of glucose released as heat. C Most of the free energy available from the oxidation of glucose remains in pyruvate, one of the products of glycolysis. D. There is no CO2 or water produced as products of glycolysis. E. Glycolysis consists of many enzymatic reactions, each of which extracts some energy from the glucose molecule. 18. If you were an enzyme and needed to perform the energetically unfavorable conversion of X to Y, you would A. couple it to a second reaction associated with a large decrease in free energy. B. couple it to a second reaction associated with a large increase in free energy. C couple it to the formation of ATP from ADP and Pi. D. couple it to an endergonic reaction.

Explanation / Answer

1.OPTION C , IN CELLS THAT ARE STORING GLUCOSE ; ONLY DARK REACTION

2. OPTION C , REDUCED BECAUSE IT ACCEPTS A HYDROGEN ATOM

3. OPTION B, EXOTHERMIC WITH DECREASE IN ENTROPY

4.OPTION E, THE FLOW OF ELCTRONS FROM PHOTOSYSTEM 2 AND PHOTOSYSTEM 1

5. OPTION A , WHERE MOST OF THE FREE ENERGY AVILABLE FROM THE OXIDATIONOF GLUCOSE IS USED IN PRODUCTION OF ATP IN GLYCOLYSIS

6. OPTION A , COUPLED IT TO A SECOND REACTION ASSOCIATED WITH A DECREASE IN FREE ENERGY

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