Q: Which of the following is the correct net equation for aerobic cellular respiration?

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

Question 1

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

Accepted Answer

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

Question 2

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site, preventing substrate binding.

Question 3

Which equation correctly represents the relationship between Gibbs free energy ($\Delta G$), enthalpy ($\Delta H$), temperature ($T$), and entropy ($\Delta S$)?

Accepted Answer

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

Question 4

During cellular respiration, which molecule is the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($O_2$)

Question 5

Which process produces the most ATP per molecule of glucose?

Accepted Answer

Oxidative phosphorylation

Question 6

If a cell is placed in a hypertonic solution, what will happen to the cell?

Accepted Answer

It will lose water and shrink.

Question 7

Which of the following is NOT a product of glycolysis?

Accepted Answer

FADH$_2$

Question 8

In the citric acid cycle, which molecule is regenerated at the end of the cycle to combine with acetyl-CoA?

Accepted Answer

Oxaloacetate

Question 9

Which statement best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

ATP stores energy in its phosphate bonds, which can be easily hydrolyzed to release energy for cellular work.

Question 10

Which of the following best describes the function of NAD$^+$ in cellular respiration?

Accepted Answer

It serves as an electron carrier, accepting electrons during glycolysis and the citric acid cycle.

Question 11

A mutation causes an enzyme to lose its ability to bind to its substrate. Which part of the enzyme is most likely affected?

Accepted Answer

The active site

Question 12

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

ATP is produced directly by transferring a phosphate group from a substrate to ADP.

Question 13

Which of the following best explains why fermentation occurs in muscle cells during intense exercise?

Accepted Answer

Oxygen supply is insufficient, so cells regenerate NAD$^+$ by reducing pyruvate to lactate.

Question 14

Which of the following is true about the movement of electrons in the electron transport chain?

Accepted Answer

Electrons are transferred through a series of protein complexes, releasing energy used to pump protons across the membrane.

Question 15

Which of the following is a consequence of cyanide poisoning at the cellular level?

Accepted Answer

Cyanide blocks the electron transport chain, preventing oxygen from accepting electrons and halting ATP synthesis.

Question 16

Which of the following is the correct net equation for aerobic cellular respiration?

Accepted Answer

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

Question 17

A cell is observed to have a high concentration of ADP and low concentration of ATP. What does this indicate about the cell's energy status?

Accepted Answer

The cell is in an energy-depleted state and needs to produce more ATP.

Question 18

Which of the following statements about the citric acid cycle is correct?

Accepted Answer

It produces ATP, NADH, and FADH$_2$ as energy carriers.

Question 19

Which of the following would most likely increase the rate of an enzyme-catalyzed reaction?

Accepted Answer

Increasing the substrate concentration up to a certain point.

Question 20

A patient is diagnosed with a genetic disorder that prevents the formation of NAD$^+$. Which process would be most directly affected?

Accepted Answer

Glycolysis, because NAD$^+$ is required to accept electrons during the oxidation of glucose.

Cellular Respiration and Metabolism: Study Notes for General Biology

Study Guide - Practice Questions

Study Guide - Flashcards