Q: Which of the following is the balanced 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 to release energy, while anabolic pathways build complex molecules from simpler ones, requiring energy input.

Question 2

A reaction has a change in free energy $$\Delta G = -15\ \mathrm{kJ/mol}. $$Which statement is correct regarding this reaction?

Accepted Answer

The reaction is spontaneous and releases energy.

Question 3

Which equation correctly relates free energy ($$\Delta G$$), enthalpy ($$\Delta H$$), entropy ($$\Delta S$$), and temperature ($$T$$)?

Accepted Answer

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

Question 4

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

Accepted Answer

They provide a different pathway for the reaction with a lower activation energy by stabilizing the transition state.

Question 5

Which of the following statements about competitive and noncompetitive enzyme inhibitors is correct?

Accepted Answer

Competitive inhibitors bind to the active site, while noncompetitive inhibitors bind to a different site on the enzyme.

Question 6

Which of the following is the balanced 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 7

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 8

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

Accepted Answer

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

Question 9

A patient’s muscle cells are deprived of oxygen. Which process will allow them to continue producing ATP, and what is the likely byproduct?

Accepted Answer

Lactic acid fermentation; lactate

Question 10

Which of the following best describes the role of NADH and FADH$$_2 in $$cellular respiration?

Accepted Answer

They carry electrons to the electron transport chain, where their energy is used to produce ATP.

Question 11

Which of the following statements about photosynthesis is correct?

Accepted Answer

The Calvin cycle occurs in the stroma and uses ATP and NADPH to fix carbon dioxide.

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 difference between oxidative phosphorylation in mitochondria and photophosphorylation in chloroplasts?

Accepted Answer

Both processes use a proton gradient to drive ATP synthesis, but the energy source is different: chemical energy from food in mitochondria and light energy in chloroplasts.

Question 14

Which of the following is a correct sequence of events in cell signaling?

Accepted Answer

Signal reception → Signal transduction → Cellular response

Question 15

A hormone travels through the bloodstream to reach distant target cells. This is an example of which type of signaling?

Accepted Answer

Endocrine signaling

Question 16

Which of the following best describes the role of second messengers such as cyclic AMP (cAMP) in cell signaling?

Accepted Answer

They relay signals from receptors on the cell surface to target molecules inside the cell.

Question 17

Which of the following scenarios best illustrates energy coupling in cellular metabolism?

Accepted Answer

The exergonic hydrolysis of ATP ($$\Delta G  0) $$such as the synthesis of glutamine from glutamate and ammonia.

Question 18

Which of the following is a consequence of the second law of thermodynamics for living organisms?

Accepted Answer

Every energy transfer increases the total entropy of the universe.

Question 19

A scientist adds a molecule that binds to an enzyme at a site other than the active site, causing a conformational change that reduces enzyme activity. What type of regulation is this?

Accepted Answer

Allosteric inhibition

Question 20

Which of the following best explains why an investment of activation energy is necessary to initiate a spontaneous reaction?

Accepted Answer

Activation energy is required to destabilize existing bonds and allow the reactants to reach the transition state.

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