Question 1

Which of the following best describes the function of the endomembrane system in eukaryotic cells?

Accepted Answer

It regulates protein traffic and performs metabolic functions such as lipid synthesis, detoxification, and packaging of molecules for transport.

Question 2

A scientist wants to observe the 3-D surface structure of a pollen grain. Which type of microscope should they use and why?

Accepted Answer

Scanning electron microscope (SEM), because it scans the surface with electrons to produce detailed 3-D images.

Question 3

Which of the following is NOT a component of the plasma membrane?

Accepted Answer

Nucleic acids

Question 4

A mutation prevents the formation of lysosomes in a cell. Which cellular process would be most directly affected?

Accepted Answer

Digestion of macromolecules and phagocytosis

Question 5

Which of the following statements about ribosomes is TRUE?

Accepted Answer

Ribosomes can be free in the cytosol or bound to the endoplasmic reticulum.

Question 6

A cell is observed to have a large number of mitochondria. What can you infer about the function of this cell?

Accepted Answer

It is likely involved in active transport and requires large amounts of ATP.

Question 7

Which of the following best explains why plant cells have both mitochondria and chloroplasts?

Accepted Answer

Chloroplasts convert light energy to chemical energy, while mitochondria convert chemical energy from food into ATP.

Question 8

A researcher is studying a cell with the following characteristics: no nucleus, circular DNA, and ribosomes. Which type of cell is being observed?

Accepted Answer

Prokaryotic cell

Question 9

Which of the following equations correctly represents the magnification ($$M) of a $$microscope if the image size is $$I$$ and the actual size of the object is $$A$$?

Accepted Answer

$$M = \frac{I}{A}$$

Question 10

Which of the following best describes the role of the Golgi apparatus in the endomembrane system?

Accepted Answer

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

Question 11

A freshwater protist uses a contractile vacuole to expel excess water. What would happen if this vacuole stopped functioning?

Accepted Answer

The cell would accumulate excess water and potentially burst.

Question 12

Which of the following structures is responsible for the movement of amoeboid cells?

Accepted Answer

Microfilaments (actin filaments)

Question 13

A mutation disrupts the formation of tight junctions in intestinal epithelial cells. What is the most likely consequence?

Accepted Answer

Fluids will leak between the cells, compromising the barrier function.

Question 14

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

Accepted Answer

Lipid synthesis and detoxification of drugs and poisons

Question 15

Which of the following best explains why mitochondria and chloroplasts are considered to have evolved from prokaryotic ancestors?

Accepted Answer

They contain free ribosomes and circular DNA similar to bacteria.

Question 16

Which of the following cell junctions allows for the passage of water and small solutes between plant cells?

Accepted Answer

Plasmodesmata

Question 17

A cell is observed to have an extensive network of rough endoplasmic reticulum. What is the most likely function of this cell?

Accepted Answer

Synthesis and secretion of proteins

Question 18

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

Accepted Answer

It facilitates communication and structural support between cells.

Question 19

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

Accepted Answer

Eukaryotic cells have their DNA enclosed within a nucleus.

Question 20

A cell biologist is studying the process of phagocytosis. Which organelle is most directly involved in digesting the engulfed material?

Accepted Answer

Lysosome

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

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