Q: During the Krebs cycle, what are the products generated from one molecule of glucose?

$$6 \text{ NADH}, 2 \text{ FADH}_2, 2 \text{ ATP}, 4 \text{ CO}_2$$

Question 1

Which of the following best describes the difference between catabolism and anabolism in cellular metabolism?

Accepted Answer

Catabolism breaks down complex molecules to release energy, while anabolism uses energy to build complex molecules.

Question 2

What is the primary role of ATP in the relationship between catabolic and anabolic reactions?

Accepted Answer

ATP stores energy released from catabolic reactions and provides it for anabolic reactions.

Question 3

Refer to the image provided. What is the correct sequence of events in enzymatic action as illustrated?

Accepted Answer

Substrate contacts active site, enzyme-substrate complex forms, substrate is transformed, products are released, enzyme is unchanged.

Question 4

Which of the following statements about enzyme structure is correct?

Accepted Answer

A holoenzyme is composed of an apoenzyme and its cofactor.

Question 5

Which factor does NOT directly affect the rate of enzymatic activity?

Accepted Answer

The genetic code of the organism

Question 6

A scientist adds a molecule to an enzyme reaction that binds to the enzyme's active site, preventing the substrate from binding. What type of inhibition is this?

Accepted Answer

Competitive inhibition

Question 7

Which of the following best describes the process of oxidative phosphorylation?

Accepted Answer

ATP is generated using energy from electrons transferred through an electron transport chain to a final electron acceptor.

Question 8

Which equation correctly represents the net ATP gain from glycolysis per molecule of glucose?

Accepted Answer

$$2 	ext{ ATP}$$

Question 9

During the Krebs cycle, what are the products generated from one molecule of glucose?

Accepted Answer

$$6 	ext{ NADH}, 2 	ext{ FADH}_2, 2 	ext{ ATP}, 4 	ext{ CO}_2$$

Question 10

Which of the following is a correct description of chemiosmosis in ATP generation?

Accepted Answer

ATP is generated by the movement of protons down their concentration gradient through ATP synthase.

Question 11

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD+ in the absence of oxygen.

Question 12

A bacterium is tested in the laboratory and is found to change the color of a pH indicator in a carbohydrate broth and produce gas. What does this indicate?

Accepted Answer

The bacterium is capable of fermentation of the carbohydrate.

Question 13

Which of the following is a correct pairing of nutritional type, energy source, and carbon source?

Accepted Answer

Chemoheterotroph: Chemicals, Organic compounds

Question 14

Which of the following best describes the difference between light-dependent and light-independent reactions in photosynthesis?

Accepted Answer

Light-dependent reactions require light to produce ATP and NADPH, while light-independent reactions use ATP and NADPH to fix CO$$_2$$ into sugar.

Question 15

Which of the following is an example of a ribozyme?

Accepted Answer

An RNA molecule that catalyzes the splicing of other RNA molecules.

Question 16

Which of the following is a correct example of substrate-level phosphorylation?

Accepted Answer

ATP production during glycolysis.

Question 17

In the context of oxidation-reduction reactions, which statement is correct?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 18

Which of the following is a product of lactic acid fermentation?

Accepted Answer

Lactic acid

Question 19

Which of the following best describes feedback inhibition in metabolic pathways?

Accepted Answer

The final product of a pathway inhibits an enzyme earlier in the pathway.

Question 20

Which of the following is true about aerobic and anaerobic respiration?

Accepted Answer

Aerobic respiration produces more ATP than anaerobic respiration.

ch 5

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