Q: Which equation correctly represents an exergonic reaction?

$$\text{Reactants} \rightarrow \text{Products} + \text{energy}$$

Q: Which of the following is an example of a hydrolysis reaction?

$$\text{Sucrose} + \text{H}_2\text{O} \rightarrow \text{Glucose} + \text{Fructose}$$

Q: Which of the following reactions is an example of a ligation reaction?

$$\text{Acetate} + \text{CoA} + \text{ATP} \rightarrow \text{Acetyl-CoA} + \text{AMP} + 2\text{P}$$

Question 1

Which of the following best describes the difference between kinetic and potential energy in the context of cellular metabolism?

Accepted Answer

Kinetic energy is the energy of motion, such as molecules moving across a membrane, while potential energy is stored energy, such as in the bonds of ATP.

Question 2

According to the first law of thermodynamics, which of the following statements is correct regarding energy in biological systems?

Accepted Answer

Energy can be converted from one form to another, but the total amount remains constant.

Question 3

Which equation correctly represents an exergonic reaction?

Accepted Answer

$$	ext{Reactants} ightarrow 	ext{Products} + 	ext{energy}$$

Question 4

Which of the following best explains why enzymes are necessary for life?

Accepted Answer

Enzymes lower the activation energy of reactions, allowing them to proceed at rates compatible with life.

Question 5

Which of the following is an example of a hydrolysis reaction?

Accepted Answer

$$	ext{Sucrose} + 	ext{H}_2	ext{O} ightarrow 	ext{Glucose} + 	ext{Fructose}$$

Question 6

A patient is experiencing low oxygen levels. Which metabolic pathway will continue to produce ATP under these conditions, and what is the byproduct?

Accepted Answer

Glycolysis; byproduct is lactate

Question 7

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

Accepted Answer

The end product of a pathway inhibits the first enzyme in the pathway, preventing overproduction.

Question 8

Which of the following is NOT a way cells regulate metabolic pathways?

Accepted Answer

By using only one enzyme for all reversible reactions

Question 9

Which of the following reactions is an example of a ligation reaction?

Accepted Answer

$$	ext{Acetate} + 	ext{CoA} + 	ext{ATP} ightarrow 	ext{Acetyl-CoA} + 	ext{AMP} + 2	ext{P}$$

Question 10

During aerobic metabolism, what is the final electron acceptor in the electron transport chain?

Accepted Answer

O$$_2$$

Question 11

Which of the following best explains why the efficiency of glucose oxidation is not 100%?

Accepted Answer

Some energy is lost as heat during the conversion of glucose to ATP.

Question 12

Which of the following equations represents the overall reaction for aerobic glucose metabolism?

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6	ext{O}_2 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O} + 	ext{energy}$$

Question 13

Which of the following statements about allosteric regulation is correct?

Accepted Answer

A modulator binds to a regulatory site, changing the enzyme's shape and activity.

Question 14

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP stores energy in its high-energy phosphate bonds and transfers energy between exergonic and endergonic reactions.

Question 15

Which of the following is a correct statement about the relationship between free energy, activation energy, and reaction spontaneity?

Accepted Answer

A reaction with a negative change in free energy ($$\Delta G \u003c 0) is $$exergonic and can proceed spontaneously, but may still require activation energy.

Question 16

Which of the following is NOT a product of the Krebs cycle for each turn of the cycle?

Accepted Answer

2 FADH$$_2$$

Question 17

Which of the following best describes chemiosmosis in the mitochondria?

Accepted Answer

The flow of H$$^+$$ ions through ATP synthase drives the phosphorylation of ADP to ATP.

Question 18

Which of the following is a correct example of an oxidation-reduction (redox) reaction?

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6	ext{O}_2 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O}$$

Energy and Cellular Metabolism: Study Notes for Anatomy & Physiology

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