Question 1

Which of the following best explains why eukaryotic cells can maintain larger sizes and more complex functions compared to prokaryotic cells?

Accepted Answer

Eukaryotic cells contain compartmentalized organelles that allow specialized functions to occur simultaneously.

Question 2

A scientist discovers a new cell type with the following features: a nucleoid region, circular DNA, ribosomes, and a cell wall, but no membrane-bound organelles. Which domain does this cell most likely belong to?

Accepted Answer

Archaea

Question 3

Which of the following best describes the function of the Golgi apparatus in a pancreatic cell that secretes digestive enzymes?

Accepted Answer

It modifies, sorts, and packages proteins for exocytosis.

Question 4

A mutation prevents the addition of a nuclear localization signal (NLS) to a protein. What is the most likely consequence for this protein?

Accepted Answer

It will remain in the cytosol and not enter the nucleus.

Question 5

Which of the following best explains how ATP hydrolysis can drive an endergonic reaction in a cell?

Accepted Answer

The free energy released from ATP hydrolysis ($$\Delta G$$ negative) is coupled to the endergonic reaction, making the overall $$\Delta G$$ negative.

Question 6

Which of the following statements about enzyme catalysis is correct?

Accepted Answer

Enzymes lower the activation energy ($$E_a) $$required for a reaction.

Question 7

A patient is diagnosed with a genetic disorder that results in nonfunctional lysosomes. Which cellular process would be most directly affected?

Accepted Answer

Autophagy and recycling of cellular components

Question 8

During glycolysis, glucose is converted to pyruvate. Which of the following best describes the net ATP and NADH yield per molecule of glucose?

Accepted Answer

2 ATP and 2 NADH

Question 9

Which of the following best explains why the electron transport chain (ETC) in mitochondria is essential for ATP production?

Accepted Answer

The ETC creates a proton gradient across the inner mitochondrial membrane, which drives ATP synthase.

Question 10

A muscle cell is deprived of oxygen but continues to contract. Which metabolic pathway is primarily responsible for ATP production under these conditions?

Accepted Answer

Lactic acid fermentation

Question 11

Which of the following best describes the role of rubisco in the Calvin cycle?

Accepted Answer

It fixes carbon dioxide by attaching it to ribulose bisphosphate (RuBP).

Question 12

Which of the following statements about the Z scheme in photosynthesis is correct?

Accepted Answer

It represents the linear flow of electrons from water through photosystem II and I to NADP+.

Question 13

A plant is exposed to a toxin that specifically inhibits PEP carboxylase. Which pathway would be most directly affected?

Accepted Answer

C4 pathway

Question 14

Which of the following best explains why C4 and CAM plants have evolved alternative carbon fixation pathways?

Accepted Answer

To minimize photorespiration and water loss in hot, dry environments.

Question 15

Which of the following is a correct sequence of events for the transport of a newly synthesized secretory protein?

Accepted Answer

Rough ER → Golgi apparatus → plasma membrane → extracellular space

Question 16

A cell is observed to have an abundance of smooth endoplasmic reticulum (SER). Which function is this cell most likely specialized for?

Accepted Answer

Lipid synthesis and detoxification

Question 17

Which of the following best describes the function of actin filaments in a migrating white blood cell?

Accepted Answer

They form a dynamic network that enables cell movement and shape changes.

Question 18

Which of the following statements about feedback inhibition in metabolic pathways is correct?

Accepted Answer

The end product of a pathway inhibits the first enzyme in the pathway.

Question 19

A researcher adds a competitive inhibitor to an enzyme-catalyzed reaction. Which of the following changes would you expect to observe?

Accepted Answer

The apparent $$K_m$$ increases, but $$V_{max}$$ remains unchanged.

Question 20

Which of the following best explains why mitochondria and chloroplasts are considered evidence for the endosymbiosis theory?

Accepted Answer

They contain their own circular DNA and ribosomes similar to prokaryotes.

General Biology Study Guide: Cell Structure, Energy, Respiration, and Photosynthesis

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