Q: Which of the following is the balanced chemical equation for aerobic cellular respiration?

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

Question 1

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

Accepted Answer

Catabolic pathways break down complex molecules into simpler ones, releasing energy, while anabolic pathways build complex molecules from simpler ones, requiring energy input.

Question 2

According to the first law of thermodynamics, which of the following statements is correct?

Accepted Answer

Energy cannot be created or destroyed, only transferred or transformed.

Question 3

A reaction has a $$\Delta G ($$change in free energy) of $$-7.3$$ kcal/mol. What does this indicate about the reaction?

Accepted Answer

The reaction is exergonic and will occur spontaneously.

Question 4

Which equation correctly represents the calculation of free energy change ($$\Delta G) in a $$system?

Accepted Answer

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

Question 5

Why is an initial investment of activation energy required for a chemical reaction to proceed?

Accepted Answer

To destabilize the reactants, allowing bonds to break and the reaction to proceed.

Question 6

Which of the following best explains how enzymes lower the activation energy of a reaction?

Accepted Answer

By stabilizing the transition state and providing an alternative reaction pathway.

Question 7

A competitive inhibitor affects an enzyme-catalyzed reaction by:

Accepted Answer

Binding to the active site, preventing substrate binding.

Question 8

Which of the following is the balanced chemical equation for aerobic cellular respiration?

Accepted Answer

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

Question 9

During which stage of cellular respiration is the majority of ATP produced, and by what process?

Accepted Answer

Electron transport chain by oxidative phosphorylation

Question 10

Which molecule acts as the final electron acceptor in the electron transport chain of aerobic respiration?

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 11

Which of the following best describes the difference between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP from a substrate, while oxidative phosphorylation uses a proton gradient and ATP synthase.

Question 12

Which adaptation allows C4 and CAM plants to minimize photorespiration?

Accepted Answer

They spatially or temporally separate carbon fixation from the Calvin cycle.

Question 13

Which of the following best describes the role of NAD+/NADH in cellular respiration?

Accepted Answer

NAD+ acts as an oxidizing agent, accepting electrons and becoming NADH, which then donates electrons to the electron transport chain.

Question 14

In photosynthesis, what is the primary function of the light-dependent reactions?

Accepted Answer

To generate ATP and NADPH for use in the Calvin cycle.

Question 15

Which of the following is a major consequence of photorespiration in plants?

Accepted Answer

Decreased efficiency of photosynthesis due to loss of fixed carbon and energy.

Question 16

Which of the following best describes the function of a G protein-coupled receptor (GPCR) in cell signaling?

Accepted Answer

It binds a ligand and activates a G protein, which then triggers downstream signaling pathways.

Question 17

Which of the following is an example of local signaling in animal cells?

Accepted Answer

Paracrine signaling involving growth factors acting on nearby cells.

Question 18

Which of the following best explains the role of second messengers such as cyclic AMP (cAMP) in signal transduction?

Accepted Answer

They relay and amplify the signal from the receptor to target molecules inside the cell.

Question 19

Apoptosis is a crucial process in multicellular organisms. Which of the following best describes its significance?

Accepted Answer

It removes damaged or unnecessary cells in a controlled manner, preventing harm to the organism.

Cellular Processes, Energy, and Signaling: Study Notes for General Biology

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