Question 1

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

Accepted Answer

Smaller cells have a higher surface-to-volume ratio, which facilitates efficient transport of nutrients and waste.

Question 2

A scientist observes a cell under a microscope and notes the presence of a membrane-bound nucleus and several organelles. To which domain does this cell most likely belong?

Accepted Answer

Eukarya

Question 3

Which structure in the plasma membrane is responsible for allowing hydrophilic molecules to pass through the hydrophobic layer?

Accepted Answer

Channel proteins

Question 4

Which of the following is NOT a function of the smooth endoplasmic reticulum?

Accepted Answer

Production of membrane and secretory proteins

Question 5

A cell is observed to have a single circular DNA chromosome, a cell wall, and flagella. Which type of cell is this most likely to be?

Accepted Answer

Prokaryotic cell

Question 6

Which equation correctly represents the surface-to-volume ratio for a cube-shaped cell with side length $$l$$?

Accepted Answer

$$\frac{6l^2$}{l^3$}$$

Question 7

Which of the following statements about mitochondria supports the endosymbiotic theory?

Accepted Answer

Mitochondria contain circular DNA similar to bacteria.

Question 8

A cell is placed in a hypotonic solution. What will most likely happen to a plant cell?

Accepted Answer

The cell will become turgid as water enters the vacuole.

Question 9

Which organelle is responsible for modifying, sorting, and shipping proteins to their final destination?

Accepted Answer

Golgi apparatus

Question 10

Which of the following best describes the function of lysosomes in animal cells?

Accepted Answer

Breakdown and recycling of biomolecules

Question 11

Which of the following is a major difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a membrane-bound nucleus.

Question 12

Which of the following structures is found in plant cells but NOT in animal cells?

Accepted Answer

Central vacuole

Question 13

Which of the following best describes the role of transport vesicles in the endomembrane system?

Accepted Answer

They carry proteins and lipids between organelles for processing and sorting.

Question 14

Which of the following cell junctions allows ions and small molecules to flow directly between animal cells?

Accepted Answer

Gap junctions

Question 15

Which of the following is a function of the cytoskeleton?

Accepted Answer

Maintenance of cell shape and movement of organelles

Question 16

Which of the following best describes the arrangement of microtubules in eukaryotic cilia and flagella?

Accepted Answer

A '9 + 2' arrangement

Question 17

Which of the following is a real-world application of the function of contractile vacuoles in protists?

Accepted Answer

They help maintain osmotic balance by expelling excess water in freshwater environments.

Question 18

Which of the following is NOT evidence supporting the endosymbiotic theory for the origin of mitochondria and chloroplasts?

Accepted Answer

They lack ribosomes.

Question 19

Which of the following best describes the function of the extracellular matrix (ECM) in animal cells?

Accepted Answer

It binds tissue cells together, supports the plasma membrane, and communicates with the cytoskeleton.

Question 20

A scientist is studying a bacterium with a capsule, cell wall, plasma membrane, and flagella. Which structure would most likely help the bacterium adhere to surfaces?

Accepted Answer

Fimbriae

A Tour of the Cell: Structure, Function, and Diversity

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