Question 1

Which of the following best describes the difference between potential and kinetic energy in biological systems?

Accepted Answer

Potential energy is stored in concentration gradients and covalent bonds, while kinetic energy is the energy of movement, such as breaking bonds and moving molecules.

Question 2

Which process is most likely to be exergonic and catabolic?

Accepted Answer

The breakdown of glucose to produce ATP.

Question 3

In a redox reaction, which molecule is oxidized?

Accepted Answer

The molecule that loses electrons.

Question 4

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

Accepted Answer

$$ATP \rightarrow ADP + P_i$$

Question 5

What is the role of enzymes in biological reactions?

Accepted Answer

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

Question 6

Which statement about ATP is correct?

Accepted Answer

ATP contains high-energy phosphate bonds that release energy when broken.

Question 7

A reaction has a $$\Delta G of$$ $$-31 kJ/$$mol. What does this indicate about the reaction?

Accepted Answer

The reaction is exergonic and releases energy.

Question 8

Which of the following is an example of feedback inhibition in metabolic pathways?

Accepted Answer

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

Question 9

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

Accepted Answer

Enzymes have active sites with shapes and chemical properties that match only certain substrates.

Question 10

Which of the following statements about competitive inhibition is correct?

Accepted Answer

A competitive inhibitor binds to the active site, preventing substrate binding.

Question 11

Which of the following is true about the coupling of reactions in metabolism?

Accepted Answer

An exergonic reaction can drive an endergonic reaction if they are coupled.

Question 12

Which of the following is a cofactor that is essential for enzyme activity in redox reactions?

Accepted Answer

NAD+

Question 13

What happens to the activation energy of a reaction when an enzyme is present?

Accepted Answer

The activation energy decreases.

Question 14

Which of the following best describes an allosteric inhibitor?

Accepted Answer

It binds to a site other than the active site and decreases enzyme activity.

Question 15

Which of the following is a correct statement about the laws of thermodynamics as applied to biological systems?

Accepted Answer

Energy cannot be created or destroyed, but can be converted from one form to another.

Question 16

Which of the following is a real-world example of reaction coupling in cells?

Accepted Answer

The phosphorylation of glucose by ATP to form glucose-6-phosphate.

Question 17

Which of the following would most likely decrease the rate of an enzyme-catalyzed reaction?

Accepted Answer

Adding a noncompetitive inhibitor.

Question 18

Which of the following is true about the transition state in enzyme-catalyzed reactions?

Accepted Answer

The enzyme stabilizes the transition state, lowering the activation energy.

Question 19

Which of the following best explains why feedback inhibition is important in metabolic pathways?

Accepted Answer

It prevents the overproduction of the final product by inhibiting an early enzyme in the pathway.

Question 20

Which of the following would most likely result from a mutation that prevents an enzyme from binding its cofactor?

Accepted Answer

The enzyme would lose its catalytic activity.

Energy and Metabolism: Foundations of Cellular Processes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드