Q: Which of the following equations correctly represents the hydrolysis of ATP?

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy}$$

Question 1

Which of the following best describes the difference between catabolic and anabolic pathways in cellular metabolism?

Accepted Answer

Catabolic pathways release energy by breaking down complex molecules, while anabolic pathways consume energy to build complex molecules.

Question 2

A firefly produces light through a chemical reaction in its cells. This is an example of which type of energy transformation?

Accepted Answer

Chemical energy to light energy

Question 3

According to the first law of thermodynamics, which of the following statements is correct?

Accepted Answer

Energy can be transferred and transformed, but it cannot be created or destroyed.

Question 4

Which of the following equations correctly represents the hydrolysis of ATP?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy}$$

Question 5

Which of the following best explains why cells must remain in an open system and never reach equilibrium?

Accepted Answer

At equilibrium, cells can no longer perform work and will die.

Question 6

Which of the following is an example of an exergonic reaction?

Accepted Answer

Hydrolysis of ATP to ADP and $$\mathrm{P}_i$$

Question 7

A reaction has a $$\Delta G of$$ $$-7.3$$ kcal/mol. What does this indicate about the reaction?

Accepted Answer

The reaction is exergonic and will occur spontaneously.

Question 8

Which of the following statements about enzymes is FALSE?

Accepted Answer

Enzymes are consumed during the reaction they catalyze.

Question 9

Which of the following best describes the effect of a competitive inhibitor on an enzyme?

Accepted Answer

It binds to the active site, preventing substrate binding.

Question 10

A metabolic pathway is regulated by feedback inhibition. Which of the following best describes this process?

Accepted Answer

The end product of the pathway inhibits an earlier enzyme in the pathway.

Question 11

Which of the following is NOT a way that enzymes lower activation energy ($$E_A$$)?

Accepted Answer

Increasing the $$\Delta G of $$the reaction

Question 12

Which of the following best describes the role of ATP in energy coupling within cells?

Accepted Answer

ATP transfers a phosphate group to other molecules, making endergonic reactions possible.

Question 13

Which of the following is an example of a coenzyme?

Accepted Answer

Vitamin B6

Question 14

A scientist increases the substrate concentration in a reaction, but the rate of product formation does not increase. What is the most likely explanation?

Accepted Answer

The enzyme is saturated and all active sites are occupied.

Question 15

Which of the following statements about entropy is correct?

Accepted Answer

Spontaneous processes increase the entropy of the universe.

Question 16

Which of the following is an example of an allosteric inhibitor?

Accepted Answer

A molecule that binds to a site other than the active site, changing the enzyme's shape.

Question 17

Which of the following best explains why high temperatures can decrease enzyme activity?

Accepted Answer

High temperatures denature the enzyme, altering its active site.

Question 18

Which of the following is true about the regeneration of ATP in cells?

Accepted Answer

ATP is regenerated from ADP and $$\mathrm{P}_i$$ using energy from catabolic reactions.

Question 19

Which of the following scenarios best illustrates the second law of thermodynamics?

Accepted Answer

A cell uses energy to maintain a highly ordered internal structure, but releases heat to the environment.

Question 20

Which of the following is a correct statement about the relationship between free energy ($$\Delta G$$), stability, and equilibrium?

Accepted Answer

Reactions with negative $$\Delta G$$ are spontaneous and move toward greater stability.

Chapter 6: An Introduction to Metabolism - Mini-Textbook Study Notes

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