Question 1

Which of the following best describes the role of the electron transport chain (ETC) in cellular respiration?

Accepted Answer

It uses the energy from electrons to pump protons across the mitochondrial membrane, creating a gradient used to synthesize ATP.

Question 2

A mutation causes a cell to lack functional intermediate filaments. Which of the following cellular processes would be most directly affected?

Accepted Answer

Maintenance of cell shape and resistance to mechanical stress.

Question 3

Which of the following equations correctly represents the net reaction of glycolysis?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 2\ \mathrm{NAD}^+ + 2\ \mathrm{ADP} + 2\ \mathrm{P_i} \rightarrow 2\ \mathrm{C_3H_4O_3} + 2\ \mathrm{NADH} + 2\ \mathrm{ATP} + 2\ \mathrm{H_2O}$$

Question 4

Which of the following is a function of the smooth endoplasmic reticulum (SER) in eukaryotic cells?

Accepted Answer

Lipid synthesis and detoxification of harmful substances.

Question 5

A scientist is studying a cell that lacks a nucleus and membrane-bound organelles, but contains a cell wall and circular DNA. Which type of cell is she most likely observing?

Accepted Answer

Bacterial cell

Question 6

Which of the following best explains why cells are generally small in size?

Accepted Answer

Smaller cells have a greater surface area-to-volume ratio, allowing for more efficient exchange of materials with their environment.

Question 7

Which of the following statements about enzyme catalysis is correct?

Accepted Answer

Enzymes lower the activation energy, thereby increasing the rate of reaction.

Question 8

A cell is exposed to a toxin that inhibits the function of the Golgi apparatus. Which process would be most directly affected?

Accepted Answer

Modification, sorting, and packaging of proteins for secretion.

Question 9

Which of the following best describes the difference between paracrine and endocrine signaling?

Accepted Answer

Paracrine signaling acts on nearby cells, while endocrine signaling involves hormones traveling through the bloodstream to distant targets.

Question 10

Which of the following is a correct statement about the function of lysosomes?

Accepted Answer

They contain digestive enzymes that break down waste materials and cellular debris.

Question 11

A mutation in a gene encoding a protein in the tight junctions of epithelial cells would most likely result in which of the following?

Accepted Answer

Increased leakage of materials between adjacent cells.

Question 12

Which of the following best describes the function of ATP synthase in the mitochondria?

Accepted Answer

It synthesizes ATP from ADP and inorganic phosphate using the energy from a proton gradient.

Question 13

Which of the following is a correct description of the role of NADH in cellular respiration?

Accepted Answer

NADH donates electrons to the electron transport chain, helping to generate a proton gradient for ATP synthesis.

Question 14

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

Accepted Answer

Oxygen is limited, so cells regenerate NAD+ by converting pyruvate to lactic acid, allowing glycolysis to continue.

Question 15

A cell is exposed to a drug that blocks the function of microtubules. Which process would be most directly affected?

Accepted Answer

Transport of vesicles within the cell.

Question 16

Which of the following best describes the function of the plasma membrane?

Accepted Answer

It acts as a selective barrier, regulating the entry and exit of substances.

Question 17

Which of the following is a correct statement about the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.

Question 18

Which of the following best describes the function of the extracellular matrix in animal tissues?

Accepted Answer

It provides structural support, regulates cell behavior, and facilitates communication between cells.

Question 19

Which of the following is a correct statement about the second law of thermodynamics as it applies to biological systems?

Accepted Answer

Every energy transfer increases the entropy (disorder) of the universe.

Question 20

A researcher adds a competitive inhibitor to an enzyme-catalyzed reaction. What is the most likely effect on the reaction?

Accepted Answer

The inhibitor binds to the active site, preventing substrate binding and decreasing the reaction rate.

Cell Structure, Function, and Energy Metabolism: Genetics Study Notes

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