Mastering Microbiology Ch. 5

Enzymes speed up the rate at which chemical reactions occur within a cell because the enzyme ____.

Which of the following is NOT a catabolic pathway or reaction? a. the conversion of citric acid to oxaloacetic acid b. the conversion of glucose to starch c. the conversion of pyruvic acid to acetyl-CoA d. the conversion of glucose to pyruvic acid

In E. coli, the presence of isoleucine shuts down the enzymatic pathway that results in the synthesis of isoleucine. This is an example of ____.

Any molecule that serves as an electron acceptor will be ____

Which of the following pathways produces the most NADH and the least ATP? a. Calvin-Benson cycle b. glycolysis c. electron transport d. Krebs cycle

The acetyl-CoA generated from beta-oxidation can be used in which of the following pathways? a. the Calvin-Benson cycle b. glycolysis c. the Krebs Cycle d. electron transport

Which of the following is an INCORRECT association? a. glycolysis: glucose 6-phosphate b. chemiosmosis: ATP synthase c. the Krebs cycle: oxaloacetic acid d. electron transport: Acetyl-CoA

Chemiosmosis uses _____ to supply the energy necessary to phosphorylate ADP to ATP.

Which of the following is NOT a possible end-product of a fermentation process? a. lactic acid b. CO2 c. glucose d. ethanol

Which of the following is NOT an electron acceptor in anaerobic respiration? a. SO4 2- b. NO3 - c. CO3 2- d. oxygen

Which of the following compounds is necessary for transamination reactions? a. amino acids b. pyridoxal phosphate c. oxaloacetic acid d. aspartic acid

Glycerol, which is necessary for the production of fats, can be derived from which of the following pathways? a. chemiosmosis b. Krebs cycle c. deamination d. Calvin-Benson cycle

Glyceraldehyde-3-phosphate is an important intermediate molecule in the cell's metabolic pathways because _____.

Organisms such as E. coli that synthesize all of the amino acids they need for life would be expected to engage in which of the following processes? a. deamination b. amination c. gluconeogenesis d. beta-oxidation

Which of the following statements about fermentation is true? a. it is an alternative way for a cell to produce oxygen b. it is an alternative way to return electron carriers to their oxidized state c. it provides additional protons to allow the electron transport chain to continue d. it allows the electron transport chain to continue in the absence of oxygen

What is the role of pyruvic acid in fermentation?

What is the fate of the NAD+ newly regenerated by fermentation?

Which of the following is an acid produced by fermentation? a. propionic acid b. lactic acid c. pyruvic acid d. ethanol e. lactic acid and propionic acid

What is the intermediate produce formed by pyruvic acid during alcoholic fermentation?

Which of the following is a by-product of the catabolism of proteins? a. ammonia b. acetyl-CoA c. lactic acid d. carbon dioxide e. proteases