Question 1

Which of the following best describes the role of enzymes in metabolic pathways?

Accepted Answer

Enzymes lower the activation energy of reactions, allowing metabolic processes to occur more efficiently.

Question 2

Which equation correctly represents the overall process of photosynthesis?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 3

A cell couples an exergonic reaction to an endergonic reaction. What is the primary benefit of this coupling?

Accepted Answer

It enables the cell to use energy released from one reaction to drive another that requires energy.

Question 4

Which of the following is an example of an anabolic pathway?

Accepted Answer

Photosynthesis building glucose from carbon dioxide and water.

Question 5

During cellular respiration, which molecule is oxidized and which is reduced?

Accepted Answer

Oxygen is reduced; glucose is oxidized.

Question 6

Which type of energy is stored in the bonds of molecules and released during cellular respiration?

Accepted Answer

Chemical energy

Question 7

A scientist measures the rate of an enzyme-catalyzed reaction and finds it decreases sharply when the temperature is raised above 40°C. What is the most likely explanation?

Accepted Answer

The enzyme is denatured at high temperatures, losing its functional shape.

Question 8

Which statement best explains why metabolic pathways are composed of multiple steps, each catalyzed by a different enzyme?

Accepted Answer

Each step allows for precise regulation and control of the pathway.

Question 9

If a cell is deprived of oxygen, which process will be directly affected first?

Accepted Answer

Electron transport chain

Question 10

Which of the following is a correct description of ATP's role in cellular energetics?

Accepted Answer

ATP stores energy in its phosphate bonds and releases it when hydrolyzed to ADP.

Question 11

Which of the following best describes the difference between exergonic and endergonic reactions?

Accepted Answer

Exergonic reactions release energy; endergonic reactions require energy input.

Question 12

A mutation changes the active site of an enzyme. What is the most likely consequence?

Accepted Answer

The enzyme may no longer bind its substrate, reducing or eliminating its activity.

Question 13

Which process is responsible for converting light energy into chemical energy in plants?

Accepted Answer

Photosynthesis

Question 14

Which of the following is a real-world example of energy conversion in living organisms?

Accepted Answer

A plant converting sunlight into glucose during photosynthesis.

Question 15

Which formula represents the hydrolysis of ATP?

Accepted Answer

$$ATP + H_2O \rightarrow ADP + P_i + energy$$

Question 16

A patient is diagnosed with a metabolic disorder that prevents the breakdown of glucose. Which pathway is most likely affected?

Accepted Answer

Glycolysis

Question 17

Which of the following statements about energy in biological systems is correct?

Accepted Answer

Energy is transformed from one form to another, but the total amount remains constant.

Question 18

Which of the following is most likely to occur if the enzyme for the first step in a metabolic pathway is inhibited?

Accepted Answer

The pathway will be blocked, and the final product will not be produced.

Question 19

Which of the following best explains why cells are considered open systems?

Accepted Answer

Cells constantly exchange energy and matter with their surroundings.

Question 20

A student adds more substrate to an enzyme-catalyzed reaction, but the reaction rate does not increase. What is the most likely explanation?

Accepted Answer

The enzyme is saturated and working at maximum capacity.

Cellular Energetics: Study Notes for General Biology

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드