Q: Which of the following equations 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 ATP in cellular metabolism?

Accepted Answer

ATP provides energy by transferring a phosphate group to other molecules, coupling exergonic and endergonic reactions.

Question 2

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

Accepted Answer

The cell will swell and possibly burst because water will move into the cell due to osmosis.

Question 3

Which of the following statements about membrane proteins is correct?

Accepted Answer

Membrane proteins can function as receptors, transporters, enzymes, or anchors.

Question 4

During the epinephrine signaling pathway, which of the following sequences correctly describes the order of events from hormone binding to cellular response?

Accepted Answer

Epinephrine binds to GPCR → G protein is activated → Adenylyl cyclase produces cAMP → Protein kinase A is activated → Glycogen breakdown.

Question 5

Which of the following best distinguishes between catabolic and anabolic pathways?

Accepted Answer

Catabolic pathways release energy by breaking down complex molecules, while anabolic pathways consume energy to build complex molecules.

Question 6

Which of the following equations 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 7

A patient is experiencing muscle fatigue during intense exercise. Which metabolic pathway is most likely responsible for the production of lactic acid in their muscles?

Accepted Answer

Lactic acid fermentation

Question 8

Which of the following best explains why enzymes are highly specific for their substrates?

Accepted Answer

Enzymes have active sites with unique shapes that fit only specific substrates, following the induced fit model.

Question 9

Which of the following statements about the Calvin cycle is correct?

Accepted Answer

The Calvin cycle uses ATP and NADPH to convert CO$$_2$$ into glucose.

Question 10

Which of the following is a key 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 11

A plant cell is placed in a hypertonic solution. What will happen to the cell and why?

Accepted Answer

The cell will undergo plasmolysis as water leaves the cell, causing the plasma membrane to pull away from the cell wall.

Question 12

Which of the following best describes the function of G protein-coupled receptors (GPCRs) in cell signaling?

Accepted Answer

GPCRs activate G proteins, which then trigger downstream signaling pathways inside the cell.

Question 13

Which of the following is true regarding the direction of osmosis?

Accepted Answer

Water moves from areas of low solute concentration to areas of high solute concentration.

Question 14

Which of the following best describes the effect of a noncompetitive inhibitor on enzyme activity?

Accepted Answer

It binds to a site other than the active site, changing the enzyme's shape and reducing its activity.

Question 15

Which molecule is oxidized and which is reduced in the overall equation for photosynthesis?

Accepted Answer

CO$$_2 is $$reduced and H$$_2O is $$oxidized.

Question 16

Which of the following best explains why high temperatures can decrease enzyme activity?

Accepted Answer

High temperatures denature the enzyme, altering its active site and preventing substrate binding.

Question 17

Which of the following is a correct sequence of the main stages of cellular respiration?

Accepted Answer

Glycolysis → Pyruvate Oxidation → Citric Acid Cycle → Oxidative Phosphorylation

Question 18

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD$$^+ in $$the absence of oxygen.

Question 19

Which of the following best describes the process of photophosphorylation in photosynthesis?

Accepted Answer

ATP is produced using the energy from light-driven electron transport and a proton gradient across the thylakoid membrane.

Question 20

A scientist adds a chemical to a solution containing an enzyme and its substrate. The chemical binds to the enzyme's active site, preventing substrate binding. What type of inhibition is this?

Accepted Answer

Competitive inhibition

BIOL 190A Midterm Study Guide: Chapters 5-8 (Membrane Transport, Cell Signaling, Metabolism, Respiration, Fermentation, Photosynthesis)

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