Q: Which equation correctly represents the overall chemical reaction for cellular respiration?

$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy (ATP)}$

Question 1

Which of the following best describes the difference between kinetic energy and potential energy in the context of cellular metabolism?

Accepted Answer

Kinetic energy is the energy of movement, such as molecules diffusing across a membrane, while potential energy is stored in chemical bonds like ATP.

Question 2

According to the first law of thermodynamics, which statement is correct regarding energy in biological systems?

Accepted Answer

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

Question 3

Which equation correctly represents the overall chemical reaction for cellular respiration?

Accepted Answer

$C_6H_{12}O_6 + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy (ATP)}$

Question 4

Which of the following best explains why enzymes are necessary for cellular metabolism?

Accepted Answer

Enzymes lower the activation energy, allowing reactions to occur more rapidly at physiological temperatures.

Question 5

A patient is experiencing muscle fatigue due to lack of oxygen. Which metabolic pathway is most likely being used to generate ATP under these conditions?

Accepted Answer

Anaerobic pathway (glycolysis followed by lactic acid fermentation)

Question 6

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

Accepted Answer

NADH is an electron carrier that donates electrons to the electron transport system, helping generate ATP.

Question 7

Which of the following reactions is classified as an exergonic reaction?

Accepted Answer

The breakdown of ATP to ADP and inorganic phosphate ($ATP \rightarrow ADP + P_i$)

Question 8

Which process directly uses a concentration gradient to perform transport work in cells?

Accepted Answer

Facilitated diffusion of glucose into the cell

Question 9

Which of the following is a dehydration reaction?

Accepted Answer

Forming a peptide bond between two amino acids, releasing water

Question 10

A cell is exposed to a toxin that inhibits the electron transport system (ETS). What is the most immediate effect on cellular metabolism?

Accepted Answer

ATP production via oxidative phosphorylation will decrease dramatically.

Question 11

Which of the following best describes feedback inhibition in metabolic pathways?

Accepted Answer

A product of a pathway inhibits an enzyme earlier in the pathway to regulate production.

Question 12

Which of the following is the correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis → Krebs cycle → Electron transport system

Question 13

If a cell's oxygen supply runs out, what happens to the electron transport system and ATP production?

Accepted Answer

The electron transport system stops, and the cell relies on glycolysis for ATP production.

Question 14

Which of the following is an example of a reduction reaction in cellular metabolism?

Accepted Answer

Conversion of NAD+ to NADH during glycolysis

Question 15

Which statement best describes the role of coenzymes in enzymatic reactions?

Accepted Answer

Coenzymes are non-protein molecules that assist enzymes by transferring chemical groups.

Question 16

Which of the following is a correct example of an exchange reaction?

Accepted Answer

$AB + CD \rightarrow AD + CB$

Question 17

During glycolysis, how many net ATP molecules are produced per molecule of glucose?

Accepted Answer

2

Question 18

Which of the following best explains why ATP is considered the universal energy currency of the cell?

Accepted Answer

ATP contains high-energy phosphate bonds that can be easily hydrolyzed to release energy for cellular work.

Question 19

Which metabolic pathway is responsible for the majority of ATP production during aerobic respiration?

Accepted Answer

Electron transport system (ETS)

Energy and Cellular Metabolism: Foundations for Anatomy & Physiology

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