Question

please answer the following questions. 1. which of the following compounds is not an enzyme? a) dehydrogenase b) cellulase c) coenzyme a d) β -galactosidase e) sucrase 2. which of the following is the best definition of oxidative phosphorylation? a) electrons are passed through a series of carriers to o2. b) a proton gradient allows hydrogen ions to flow back into the cells through transmembrane protein channels, releasing energy that is used to generate atp. c) atp is directly transferred from a substrate to adp. d) electrons are passed through a series of carriers to an organic compound. 3. from the list below, which is not produced during the krebs cycle? a) fadh2 b) nadh c) atp d) nadph e) co2 4. two molecules containing the same types and numbers of atoms but different bonding sequences are called enantiomers.

Explanation:

1. Enzymes are proteins that catalyze biochemical reactions. Coenzyme A is a co - factor, not an enzyme. Dehydrogenase, cellulase, β - galactosidase, and sucrase are all enzymes.
2. Oxidative phosphorylation is the process in which a proton gradient allows hydrogen ions to flow back into the cells through transmembrane protein channels, releasing energy used to generate ATP. Option A describes electron - transport chain without phosphorylation, option C is substrate - level phosphorylation, and option D is not the correct description of oxidative phosphorylation.
3. In the Krebs cycle, FADH2, NADH, ATP, and CO2 are produced. NADPH is produced in the light - reactions of photosynthesis and the pentose phosphate pathway, not in the Krebs cycle.
4. Molecules with the same types and numbers of atoms but different bonding sequences are isomers. Enantiomers are a type of stereoisomer with non - superimposable mirror images. The statement is False.

Answer:

1. C. coenzyme A
2. B. A proton gradient allows hydrogen ions to flow back into the cells through transmembrane protein channels, releasing energy that is used to generate ATP.
3. D. NADPH
4. False