Which of the following statements is true regarding the elec

Which of the following statements is true regarding the electron donors in bacterial metabolism? A. The use of inorganic compounds as electron donors is known as organotropy. B. Litholrophy refers to the use of organic molecules as electron sources. C. An organotroph could carry out respiration but it could not metabolize via fermentation. D. Fe^2+, H_2S, or H_2 would be suitable electron donors for lithotrophs. E. None are true; all are false statements Which is false regarding catabolic processes? A. They release energy. B. They lead to the formation of smaller molecules from larger, complex molecules. C. Such processes are often coupled, or linked, to ATP formation reactions (i.e., ADP + P to ATP). D. None are false; A-C are true statements. Which is true regarding the TCA cycle (Krebs cycle)? A. pyruvate is an end product of the cycle B. energy capture in the cycle is solely from the formation of ATP in one of the steps C. entry of carbon dioxide starts the cycle D. some components of the cycle are used as building blocks for certain anabolic pathways E. two of the above are true The metabolic reaction, A + B rightarrow C + D, has a delta G of +3.5 kJ/mol. Which choice among A-D is one that would not likely convert this to a negative delta G process? A. Provide a 10-fold excess of reactants A and B over products C and D. B. Combine ATP formation to this metabolic reaction. C. Remove products C and D as they are made D. Link the metabolic reaction above (A + B C + D) to one that uses C and D as reactants.

Solution

7.. option D is correct.

organotrophy- use of organic compounds

lithotrophy- use of inorganic compounds

8. all are true regarding catabolism.

9. option E

direct ATP is formed from substrate level phosporylation in one step (succinyl CoA to succinate). therefore, option B may be correct.

the products in krebs cycle are used in anabolic pathways.

10. option B.

ATP formation from ADP has delta G of +30.5kJ/mol.

combining both positive G values would not result in negative delta G.