Question

URGENT I NEED HELP AND I HAVE A DEADLINE. PLEASE AND THANK YOU.

1. Which kind of pathway describes glycolysis best?

a. catabolic and synthetic

b. aerobic and catabolic

c. glycolytic and aerobic

d. anaerobic and catabolic

2. which reaction occurs most often during aerobic cellular respiration?

a. condensation

b. phosphorylation

c. redox

d. hydrolysis

3. What is the function of oxygen in oxidative phosphorylation?

a. to hydrolyze carbohydrates

b. to accept electrons from the reduction of NADP

c. to accept electrons during citric acid cycle

d. to add hydrogen ions to pyruvate at the end of glycolysis

4. what occurs during glycolysis?

a. the division of a six-carbon molecule into two molecules, each with three carbon atoms

b. the transfer of electrons and protons to NAD molecules

c. the synthesis of ATP, which is later broken down to ADP and P₁

d. all of the above

5. what does pyruvate oxidation entail?

a. the formation of NADH

b. coenzyme A

c. the release of carbon dioxide

d. all of the above

6. which of the following occurs during glycolysis?

a. the formation of four ATP molecules

b. the addition of two phosphates to glucose

c. the formation of two molecules of pyruvate

d. all of the above

Answer 1

1. In glycolysis glucose is broken down into pyruvate so it is a catabolic pathway. Glycolysis doesn't require oxygen hence it is anaerobic as well. So answer is (D).

2. Redox includes reduction (gain of electron) and oxidation (loss of electron) which occurs most in the aerobic respiration then comes the phosphorylation. Even the phosphorylation is oxidative. So answer is (C).

3. Oxygen in oxidative phosphorylation comes at the end of Electron Transport Chain (ETC) where it accepts electrons from the reduction of NADP and take H+ to form water. This drives the chemiosmosis and forms ATP. So answer is (B).

4. In glycolysis, 1 molecule glucose (a 6C molecule) is broken down to produce 2 molecules of pyruvate, 2 molecules of NADH and 2 molecules of ATP (net result). ATPs produced are later broken down to ADP and Pi (inorganic phosphate) . So answer is (D).

5. Pyruvate oxidation occurs in the cytoplasm of prokaryotes in which a pyruvate is converted to form acetyl CoA, NADH and CO2. So answer is (D).

6. In glycolysis 2 phosphates from 2 molecules of ATP is used. Total 4 ATPs are produced. In the last step 2 molecules of pyruvate is formed. Hence the answer is (D).