Reference no: EM133388279

Question 1.

1.My son is in Grade 3 and he knows that photosynthesis requires light. But he probably doesn't know that it requires water.

What is the critical role served by water in oxygenic photosynthesis?

A. It interacts with photons of light resulting in the release of electrons and protons.

B. It supplies the electrons that reduce molecules of P680+.

C. It produces O2 which is needed for oxidative phosphorylation.

D. It is the final product of the electron transport chain after P700+.

Question 2.

The Calvin Cycle is the primary mechanism whereby atmospheric CO2 gets fixed into sugar.

Which of the following statements about the Calvin Cycle is correct?

1. Because it's a cycle, some reactions are required simply to regenerate the substrate for rubisco.

2. Some reactions of the Calvin Cycle require ATP coupling because they are endergonic.

3. Overall, the reactions of the Calvin Cycle chemically reduce molecules of CO2.

4. The Calvin Cycle is often called the "Dark Reactions" because it doesn't actually need the products of the Light Reactions to operate.

A. 1,2 and 3

B. 1 and 3

C. 2 and 4

D. 4 only

E. All of 1,2,3 and 4 are correct

Question 3.

Why is glycolysis considered to be one of the first metabolic pathways to have evolved?

A. Because it does not directly generate ATP.

B. Because it does not involve membranes and does not require oxygen.

C. Because it is found in prokaryotic cells but not in eukaryotic cells.

D. Because it relies on chemiosmosis, which is an ancient metabolic process.

Question 4.

Metabolism is built on two distinctly different types of pathways: catabolic and anabolic.

Which of the following statements correctly identifies an aspect of these pathways?

1. Anabolic pathways often require energy coupling reactions with ATP.

2. All the reactions of an anabolic pathway are endergonic.

3. Overall, a catabolic pathway has a negative change in free energy.

4. Photosynthesis is an example of a catabolic pathway.

A. 1, 2 and 3

B. 1 and 3

C. 2 and 4

D. 4 only

E. All of 1,2,3 and 4 are correct

Question 5.

A characteristic of tumor cells is that they have a higher growth rate relative to non-cancer cells. This high growth rate is supported through remodeling of key parts of cellular respiration.

Compared to aerobically growing non-cancer cells, in what way is cellular respiration different in cancer cells?

A. In cancer cells there is upregulation of acetyl CoA oxidation.

B. In cancer cells there is a down regulation of the glycolytic enzyme hexokinase.

C. In cancer cells there is increased rate of oxidative phosphorylation.

D. In cancer cells there is inhibition of the pyruvate dehydrogenase complex.