Refer to the figure to the below to answer questions 33-35 (1 point each) Carbon
ID: 41721 • Letter: R
Question
Refer to the figure to the below to answer questions 33-35 (1 point each) Carbon for amino biosynthesis are supplied by intermediates of the Krebs cycle. Which intermediate would supply the carbon skeleton for synthesis of a 5-carbon amino acid? B. citric acid A. isocitric acid D. succinic acid C. malic acid E. a-ketoglutaric acid Krebs Cycle NAor 34. Starting with one molecule of isocitrate M. (isocitric acid) and ending with fumarate (fumaric acid), what is the maximum number of ATP molecules that could be made through substrate-level phosphorylation? C. 11 D. 12 E. 24 A. 1 B. 2 35. In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP P to ATP? A. energy released as electrons flow through the electron transport system B. energy released from substrate-level phosphorylation C. energy released from ATP synthase pumping hydrogen ions against their concentration gradient D. energy released from movement of protons through ATP synthase E. No external source of energy is required because the reaction is exergonic.Explanation / Answer
33. E. Alpha-ketoglutaric acid would supply the carbon skeleton for a 5 carbon amino acid.
The citric acid cycle is key in supplying various biochemical pathways with precursors needed for synthesizing molecules. Reactions that involve