Q: Which equation correctly represents the overall process of 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 role of cholesterol in the plasma membrane of animal cells?

Accepted Answer

It increases membrane fluidity at low temperatures and decreases fluidity at high temperatures.

Question 2

A red blood cell is placed in a hypotonic solution. What will most likely happen to the cell, and which process is responsible?

Accepted Answer

The cell will swell and possibly burst due to water entering by osmosis.

Question 3

Which equation correctly represents the overall process of 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 4

During which stage of cellular respiration is the majority of ATP produced, and what is the main mechanism?

Accepted Answer

Oxidative phosphorylation via the electron transport chain and chemiosmosis

Question 5

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy ($E_a$) of a reaction, increasing the rate without being consumed.

Question 6

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site, preventing substrate binding.

Question 7

Which process in photosynthesis directly produces oxygen ($O_2$) as a byproduct?

Accepted Answer

The splitting of water ($H_2O$) during the light reactions

Question 8

Which of the following is a correct description of the Calvin cycle?

Accepted Answer

It uses ATP and NADPH to convert $CO_2$ into G3P (a sugar) in the stroma of the chloroplast.

Question 9

Which of the following best explains why fermentation is necessary in the absence of oxygen?

Accepted Answer

It regenerates NAD$^+$ so glycolysis can continue to produce ATP.

Question 10

A cell is exposed to a signaling molecule that binds to a receptor on its surface, triggering a cascade of phosphorylation events. This is an example of:

Accepted Answer

Signal transduction via a phosphorylation cascade

Question 11

Which of the following equations correctly represents the hydrolysis of ATP?

Accepted Answer

$\mathrm{ATP} + \mathrm{H_2O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}$

Question 12

Which of the following is true about passive transport across a cell membrane?

Accepted Answer

It moves substances down their concentration gradient without energy input.

Question 13

Which of the following is a real-world example of active transport in human physiology?

Accepted Answer

The sodium-potassium pump ($3\mathrm{Na^+}$ out, $2\mathrm{K^+}$ in) in nerve cells

Question 14

Which statement best describes the difference between C4 and CAM photosynthesis?

Accepted Answer

C4 plants separate carbon fixation and the Calvin cycle spatially, while CAM plants separate them temporally.

Question 15

Which of the following is an example of bulk transport across the plasma membrane?

Accepted Answer

Phagocytosis of bacteria by white blood cells

Question 16

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

Accepted Answer

They donate electrons to the electron transport chain, driving ATP synthesis.

Question 17

Which of the following is a correct statement about the thermodynamics of biological systems?

Accepted Answer

Biological systems obey the laws of thermodynamics, including conservation of energy ($\Delta E = 0$ for a closed system).

Question 18

A mutation causes a cell to produce a nonfunctional G protein-coupled receptor (GPCR). Which process would be most directly affected?

Accepted Answer

Cell signaling via extracellular ligands

Question 19

Which of the following is a correct multi-step pathway for aerobic cellular respiration starting from glucose?

Accepted Answer

Glycolysis $\rightarrow$ Pyruvate Oxidation $\rightarrow$ Citric Acid Cycle $\rightarrow$ Electron Transport Chain

Question 20

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

Accepted Answer

Its hydrolysis releases energy that can be coupled to endergonic reactions.

General Biology Study Guide: Membranes, Energy, Cellular Respiration, Photosynthesis, and Cell Communication (Chapters 7–11)

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