Question

13) When a molecule of glucose gets split during the energy investment phase of glycolysis, the products are two molecules of that then move to the energy payoff phase. A) Glyceraldehyde-3-phospahte B) Pyruvate C) Acetyl-COA D) NADH 14) Following glycolysis and the citric acid cycle, but before the electron transport chain and oxidative phosphorylation, the carbon skeleton of glucose has been broken down to CO2 with some net gain of ATP. Most of the energy from the original glucose molecule at that point in the process, however, is stored in the form of which of the following molecules? A) acetyl-CoA B) NAD+ C) pyruvate D) NADH 15) If pyruvate oxidation is blocked, what would happen to the levels of oxaloacetate in the citric acid cycle? A) Oxaloacetate will decrease. B) Oxaloacetate will accumulate. C) Oxaloacetate will remain unchanged. D) Oxaloacetate start fluctuating throughout the citric acid cycle. 16) Which one of the following is formed by the removal of a carbon (as CO2) from a molecule of pyruvate? A) ATP B) acetyl COA C) citrate D) water 17) Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. Which of the following approaches would be the best way to detect the lack of photosystem II in these organisms? A) Determine whether they have thylakoid membranes. B) Determine whether they consume CO2 in the dark. C) Determine whether they produce O2 in the light. D) Determine the action spectrum for photosynthesis in these organisms. 18) Which of the following statements best describes the relationship between photosynthesis and respiration? A) Photosynthesis releases energy from complex organic molecules; respiration stores energy in complex organic molecules B) Photosynthesis stores energy in complex organic molecules; respiration releases energy from complex organic molecules C) Photosynthesis occurs only in plants; respiration occurs only in animals. D) Photosynthesis is catabolic: respiration is anabolic.

Answer 1

1. (B)The answer is 2 pyruvate molecules are formed. The 6 carbon atom is split into two 3 carbon atom pyruvate molecules

2.(A) Most of the energy is stored in the form of acetyl CoA, which is later used as the Kreb cycle and electron transport chain.

3.(B) The oxaloacetate would accumulate and citric acid would decrease, the pyruvate oxidation is blocked.

4.(B) The acetyl CoA is formed on removing the carbon from the pyruvate. The oxidized two-carbon molecule, an acetyl group, is attached to Coenzyme A to form acetyl CoA.

5.(A)
Determine whether they have thylakoid membrane because the thylakoid stacking in the absence of photosystem II

5. (B)Photosynthesis stores energy as complex energy molecules and respiration releases energy from the complex molecules,

For example, glucose is stored as energy molecules after photosynthesis and oxygen is released from the glucose as complex molecules.