Q: Which equation 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 metabolism in living organisms?

Accepted Answer

The sum of all chemical reactions occurring within an organism.

Question 2

A metabolic pathway is characterized by which of the following features?

Accepted Answer

It begins with a specific molecule and ends with a product, with each step catalyzed by a specific enzyme.

Question 3

Which of the following is a product of a catabolic reaction?

Accepted Answer

An amino acid like tryptophan

Question 4

Which statement best explains why ATP has more potential energy than ADP?

Accepted Answer

ATP has three phosphate groups, while ADP has only two, and the bonds between phosphate groups store significant energy.

Question 5

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

Accepted Answer

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

Question 6

Which of the following reactions is most likely to be exergonic?

Accepted Answer

The digestion of protein from food into amino acids

Question 7

Which equation correctly represents the hydrolysis of ATP?

Accepted Answer

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

Question 8

If you were studying a new kind of fungus and wanted to know how much energy was immediately available to power metabolism, which molecule would you measure?

Accepted Answer

ATP

Question 9

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

Enzymes lower the activation energy required for a reaction to proceed.

Question 10

Which of the following is true about competitive enzyme inhibitors?

Accepted Answer

They bind to the active site of the enzyme and compete with the substrate.

Question 11

Which of the following is an example of energetic coupling in cells?

Accepted Answer

Using the energy released from ATP hydrolysis to drive the synthesis of macromolecules.

Question 12

Which of the following statements about entropy is correct?

Accepted Answer

Entropy is a measure of molecular disorder, and it increases in the universe during energy transformations.

Question 13

Which of the following best describes an endergonic reaction?

Accepted Answer

A reaction that requires an input of energy and has a positive $$ \Delta G .$$

Question 14

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

Accepted Answer

ATP is regenerated by adding a phosphate group to ADP, using energy from catabolic reactions.

Question 15

Which of the following is a real-world example of a competitive inhibitor?

Accepted Answer

Ibuprofen and other NSAIDs inhibiting the COX-2 enzyme.

Question 16

Which of the following equations correctly represents the change in free energy for a spontaneous reaction?

Accepted Answer

$$ \Delta G \u003c 0 $$

Question 17

A cell uses ATP to phosphorylate a reactant molecule. What is the immediate effect of this phosphorylation?

Accepted Answer

The reactant molecule becomes more reactive and can participate in an endergonic reaction.

Question 18

Which of the following best explains why enzymes are highly specific for their substrates?

Accepted Answer

The shape and chemical environment of the enzyme's active site fit only specific substrates.

Question 19

Which of the following statements about activation energy ($$ E_a ) is $$correct?

Accepted Answer

Activation energy is the energy required to start a chemical reaction.

Chapter 6: An Introduction to Metabolism – Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드