Question 1

Which of the following best describes the difference between catabolic and anabolic pathways in cellular metabolism?

Accepted Answer

Catabolic pathways release energy by breaking down complex molecules, while anabolic pathways consume energy to build complex molecules.

Question 2

According to the First Law of Thermodynamics, which statement is correct?

Accepted Answer

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

Question 3

A chemical reaction has a change in free energy $$\Delta G = -30 \ \mathrm{kJ/mol}. $$What does this indicate about the reaction?

Accepted Answer

The reaction is exergonic and will occur spontaneously.

Question 4

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

Accepted Answer

Glucose molecules stored in the liver.

Question 5

The hydrolysis of ATP to ADP and inorganic phosphate ($$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i) is $$considered:

Accepted Answer

An exergonic reaction because it releases energy.

Question 6

Which statement about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy ($$E_a) of a $$reaction.

Question 7

A cell needs to move sodium ions against their concentration gradient. Which type of cellular work is this?

Accepted Answer

Transport work

Question 8

Which of the following best explains how ATP couples exergonic and endergonic reactions in cells?

Accepted Answer

ATP hydrolysis directly provides energy for endergonic reactions by transferring a phosphate group.

Question 9

Which of the following is true about equilibrium in metabolic pathways?

Accepted Answer

Cells avoid equilibrium in metabolic pathways to allow continuous flow of materials and energy.

Question 10

Which of the following is a correct statement about the ATP cycle in cells?

Accepted Answer

ATP is synthesized from ADP and $$P_i$$ using energy from catabolic reactions.

Question 11

Which of the following reactions is endergonic?

Accepted Answer

Synthesis of glucose from CO$$_2$$ and H$$_2O $$during photosynthesis

Question 12

A scientist measures the change in free energy for a reaction and finds $$\Delta G = 0. $$What does this mean?

Accepted Answer

The reaction is at equilibrium and no net change will occur.

Question 13

Which of the following best describes the role of the enzyme's active site?

Accepted Answer

It binds substrates and catalyzes the chemical reaction.

Question 14

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 15

Which statement about enzyme specificity is correct?

Accepted Answer

Enzymes are highly specific due to the unique shape of their active site.

Question 16

If a reaction has $$\Delta G \u003e 0$$, which of the following is true?

Accepted Answer

The reaction is endergonic and requires energy input.

Question 17

Which of the following is NOT a way that enzymes speed up chemical reactions?

Accepted Answer

Increasing the $$\Delta G of $$the reaction

Question 18

Which process in cells is an example of chemical work performed by ATP?

Accepted Answer

Synthesis of proteins from amino acids

Question 19

During energy coupling, which molecule is most often phosphorylated by ATP to drive endergonic reactions?

Accepted Answer

A reactant molecule involved in the endergonic reaction

Question 20

Which of the following best explains why ATP is considered a renewable resource in cells?

Accepted Answer

ATP is constantly regenerated from ADP and $$P_i$$ using energy from catabolic reactions.

Metabolism and Enzyme Function: An Introduction to Bioenergetics

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