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 movement, while potential energy is stored energy, such as in chemical bonds.

Question 2

According to the second law of thermodynamics, what happens to energy during metabolic reactions in the human body?

Accepted Answer

Energy is transformed with some lost as heat, increasing entropy.

Question 3

Which of the following reactions is an example of a decomposition reaction as shown in Table 4.2?

Accepted Answer

$$AB \rightarrow A + B$$

Question 4

A patient is experiencing muscle fatigue due to low ATP levels. Which process is most directly responsible for the production of ATP in human cells?

Accepted Answer

Electron transport chain in the mitochondria

Question 5

Which equation correctly represents the hydrolysis of ATP?

Accepted Answer

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

Question 6

Which of the following best explains why enzymes lower the activation energy of a reaction?

Accepted Answer

Enzymes provide an alternative reaction pathway with lower activation energy.

Question 7

In the context of metabolism, which statement is true about anabolic and catabolic reactions?

Accepted Answer

Catabolic reactions release energy, while anabolic reactions require energy.

Question 8

Which factor would most likely increase the rate of an enzyme-catalyzed reaction according to the provided graph?

Accepted Answer

Increasing the amount of enzyme present

Question 9

During glycolysis, which molecule is produced and then used in the electron transport chain to generate ATP?

Accepted Answer

NADH

Question 10

Which of the following is a correct general equation for an enzyme-catalyzed reaction?

Accepted Answer

$$A + B \xrightarrow{enzyme} C + D$$

Question 11

A scientist observes that a reaction releases energy and increases entropy. Which type of reaction is this most likely to be?

Accepted Answer

Exergonic

Question 12

Which of the following best describes the role of NADH in cellular respiration?

Accepted Answer

NADH carries electrons to the electron transport chain for ATP production.

Question 13

Which of the following is NOT a type of work performed by cells as described in the study materials?

Accepted Answer

Electrical work

Question 14

If the concentration of substrate is increased while the enzyme concentration remains constant, what will happen to the reaction rate?

Accepted Answer

The reaction rate will increase until the enzyme is saturated.

Question 15

Which of the following is an example of a single displacement reaction?

Accepted Answer

$$L + MX \rightarrow LX + M$$

Question 16

Why is compartmentalization of enzymes within intracellular organelles important for metabolism?

Accepted Answer

It prevents interference between incompatible metabolic pathways.

Question 17

Which statement about the ATP/ADP ratio is correct?

Accepted Answer

A high ATP/ADP ratio indicates high energy availability for cellular processes.

Question 18

Which of the following is a correct statement about the chemical reaction rate?

Accepted Answer

It is defined as the amount of product formed per unit time.

Question 19

Which of the following is true about the role of free energy in endergonic and exergonic reactions?

Accepted Answer

Endergonic reactions require an input of free energy.

Question 20

Which of the following best describes the function of enzymes in biological systems?

Accepted Answer

Enzymes decrease the activation energy, speeding up reactions.

Energy and Cellular Metabolism: Foundations for Anatomy & Physiology

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