Question 1

Which of the following best describes the difference between catabolic and anabolic pathways as shown in the first image?

Accepted Answer

Catabolic pathways break down macromolecules to release energy, while anabolic pathways use energy to build macromolecules from smaller units.

Question 2

According to the ATP cycle diagram, which statement correctly explains the coupling of endergonic and exergonic reactions in cells?

Accepted Answer

ATP hydrolysis is exergonic and can drive endergonic reactions by transferring a phosphate group.

Question 3

In the enzyme-substrate complex shown in the third image, what is the primary role of the enzyme?

Accepted Answer

To lower the activation energy and speed up the reaction.

Question 4

Which process is illustrated in the fourth image, where two substrates are joined together by an enzyme?

Accepted Answer

Anabolic reaction

Question 5

Based on the concept map of energy transformations, which of the following is true about ATP hydrolysis?

Accepted Answer

ATP hydrolysis is an exergonic reaction with $$\Delta G \u003c 0.$$

Question 6

In the enzyme-catalyzed phosphorylation reaction shown, what is the immediate result of transferring a phosphate group to the substrate?

Accepted Answer

The substrate is phosphorylated, increasing its potential energy.

Question 7

During glycolysis, as shown in the energy investment and payoff diagrams, what is the net gain of ATP and NADH per molecule of glucose?

Accepted Answer

2 ATP and 2 NADH

Question 8

Which of the following best explains why oxygen is required for the electron transport chain in cellular respiration?

Accepted Answer

Oxygen is the final electron acceptor, allowing the chain to continue and ATP to be produced.

Question 9

In the citric acid cycle diagram, what is the main purpose of the cycle in terms of energy transfer?

Accepted Answer

To reduce NAD$$^+$$ and FAD to NADH and FADH$$_2$$, which carry electrons to the electron transport chain.

Question 10

Which statement best describes the role of enzymes in metabolic pathways, as illustrated in the provided images?

Accepted Answer

Enzymes lower the activation energy, allowing metabolic reactions to proceed rapidly and efficiently.

Question 11

Which of the following best explains why glycolysis can occur in the absence of oxygen?

Accepted Answer

Glycolysis does not require the electron transport chain or oxygen as an electron acceptor.

Question 12

What is the significance of substrate-level phosphorylation during glycolysis?

Accepted Answer

It directly generates ATP by transferring a phosphate group from a substrate to ADP.

Question 13

Which of the following is a correct description of the ATP synthase function in the mitochondria?

Accepted Answer

ATP synthase uses the flow of H$$^+$$ ions down their concentration gradient to synthesize ATP from ADP and Pi.

Question 14

Which of the following best describes the relationship between exergonic and endergonic reactions in cellular metabolism?

Accepted Answer

Exergonic reactions release energy that can be used to drive endergonic reactions, often through ATP hydrolysis and synthesis.

Question 15

Which of the following is a real-life example of an exergonic reaction in human cells?

Accepted Answer

Cellular respiration breaking down glucose to produce ATP

Question 16

Which of the following statements about the electron carriers NADH and FADH$$_2 is $$correct?

Accepted Answer

NADH and FADH$$_2$$ donate electrons to the electron transport chain, which leads to ATP production.

Question 17

Which of the following best explains why enzymes are necessary for both catabolic and anabolic reactions in cells?

Accepted Answer

Enzymes lower the activation energy for both types of reactions, allowing them to proceed at biologically relevant rates.

Bioenergetics, Enzymes, Cellular Respiration, Photosynthesis, and Cell Signaling

Study Guide - Practice Questions