Question 1

Which of the following statements best summarizes the cell theory?

Accepted Answer

All living organisms are made of cells, and all cells arise from pre-existing cells.

Question 2

A scientist observes a cell with a plasma membrane, ribosomes, circular DNA in a nucleoid region, and no membrane-bound organelles. Which type of cell is being observed?

Accepted Answer

Prokaryotic cell

Question 3

Which of the following is a major factor that limits the maximum size of a cell?

Accepted Answer

Surface area-to-volume ratio

Question 4

A cell is observed to have a nucleus, mitochondria, and chloroplasts. To which kingdom does this cell most likely belong?

Accepted Answer

Plant

Question 5

Which organelle is responsible for synthesizing proteins in all types of cells?

Accepted Answer

Ribosome

Question 6

A mutation prevents the formation of the nuclear envelope in a eukaryotic cell. Which of the following is a likely consequence?

Accepted Answer

DNA would be exposed to enzymes in the cytosol and could be degraded.

Question 7

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

It modifies, sorts, and packages proteins for secretion or delivery to other organelles.

Question 8

Which structure is found in plant cells but not in animal cells?

Accepted Answer

Chloroplast

Question 9

According to the endosymbiotic theory, which organelles are believed to have originated from free-living prokaryotes?

Accepted Answer

Mitochondria and chloroplasts

Question 10

A cell with a high number of lysosomes is most likely specialized for which function?

Accepted Answer

Digesting and recycling cellular waste

Question 11

Which of the following equations correctly represents the surface area-to-volume ratio for a cube-shaped cell?

Accepted Answer

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

Question 12

Which of the following is NOT a characteristic shared by all cells?

Accepted Answer

Chloroplasts

Question 13

A scientist is studying a cell that contains a 9+2 arrangement of microtubules in its appendages. Which structure is being observed?

Accepted Answer

Motile cilium or flagellum

Question 14

Which of the following best explains why animal cells are typically smaller and more numerous than plant cells?

Accepted Answer

Smaller cells have a higher surface area-to-volume ratio, allowing efficient exchange of materials.

Question 15

Which organelle is responsible for producing ATP, the energy currency of the cell?

Accepted Answer

Mitochondrion

Question 16

Which of the following is a function of the cytoskeleton?

Accepted Answer

Providing mechanical support and facilitating intracellular transport

Question 17

Which of the following statements about viruses is correct?

Accepted Answer

Viruses are not considered living because they lack cellular structure.

Question 18

A mutation in a plant cell prevents the formation of the central vacuole. Which of the following is a likely consequence?

Accepted Answer

The cell would have difficulty maintaining its shape and storing water.

Question 19

Which of the following best describes the role of the nucleolus?

Accepted Answer

It is involved in processing RNA and making ribosomes.

Question 20

Which of the following is a key difference between prokaryotic and eukaryotic DNA?

Accepted Answer

Prokaryotic DNA is usually circular and found in the nucleoid, while eukaryotic DNA is linear and found in the nucleus.

Introduction to Cell Structure: Prokaryotic and Eukaryotic Cells

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