Question 1

Which statement best describes the role of metabolism in living organisms?

Accepted Answer

Metabolism is the sum of all chemical reactions that transform matter and energy in an organism.

Question 2

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

Accepted Answer

The synthesis of proteins from amino acids.

Question 3

According to the first law of thermodynamics, which of the following is true about energy in biological systems?

Accepted Answer

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

Question 4

A cell couples an exergonic reaction to an endergonic reaction. Which statement best explains why this is necessary?

Accepted Answer

Endergonic reactions require energy input, which is supplied by the energy released from exergonic reactions.

Question 5

Which equation correctly represents the free energy change ($$\Delta G) of a $$chemical reaction?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 6

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

Accepted Answer

Enzymes lower the activation energy, speeding up chemical reactions.

Question 7

A scientist measures the energy transformation in a leaf during photosynthesis. Which form of energy is primarily converted during this process?

Accepted Answer

Light energy to chemical energy

Question 8

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in its phosphate bonds and powers cellular work by coupling exergonic and endergonic reactions.

Question 9

A metabolic pathway is regulated by feedback inhibition. What is the most likely effect of this regulation?

Accepted Answer

The end product of the pathway inhibits the activity of the first enzyme, slowing down the pathway.

Question 10

Which of the following is a consequence of the second law of thermodynamics in biological systems?

Accepted Answer

Every energy transfer increases the entropy ($$S) of $$the universe.

Question 11

A reaction has $$\Delta G = +5$$ kcal/mol. What does this indicate about the reaction?

Accepted Answer

The reaction is endergonic and requires energy input to proceed.

Question 12

Which of the following is NOT a way that enzymes help control metabolism?

Accepted Answer

Enzymes are permanently altered after each reaction.

Question 13

A student is studying the conversion of glucose to pyruvate during glycolysis. Which type of metabolic pathway does this represent?

Accepted Answer

Catabolic pathway

Question 14

Which of the following best explains why living organisms require a constant input of energy?

Accepted Answer

To maintain order and carry out cellular processes despite the tendency toward increased entropy.

Question 15

Which of the following is an example of kinetic energy in a biological system?

Accepted Answer

The movement of cilia on a cell surface.

Question 16

If a metabolic pathway is blocked due to a nonfunctional enzyme, what is the most likely result?

Accepted Answer

The substrate for the blocked reaction will accumulate.

Question 17

Which of the following statements about the regeneration of ATP is correct?

Accepted Answer

ATP is regenerated from ADP and inorganic phosphate ($$P_i) $$using energy from catabolic reactions.

Question 18

A cell is observed to have a high rate of exergonic reactions but low ATP production. Which process is most likely impaired?

Accepted Answer

Coupling of exergonic and endergonic reactions.

Question 19

Which of the following best describes the relationship between entropy ($$S) $$and biological order?

Accepted Answer

Living organisms maintain order by decreasing entropy locally, but increase entropy in their surroundings.

Question 20

A researcher adds a competitive inhibitor to an enzyme-catalyzed reaction. What is the expected effect?

Accepted Answer

The inhibitor binds to the enzyme's active site, decreasing the rate of reaction.

Introduction to Metabolism: Transforming Matter and Energy in Biological Systems

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