Question 1

Which of the following best explains why most cells are microscopic in size rather than large, visible structures?

Accepted Answer

Because smaller cells have a larger surface area-to-volume ratio, which facilitates efficient exchange of materials with their environment.

Question 2

A scientist is using a microscope to observe the internal structure of mitochondria. Which type of microscope should she use and why?

Accepted Answer

Transmission electron microscope, because it provides high resolution images of internal cell structures.

Question 3

Which of the following statements about the plasma membrane is correct?

Accepted Answer

It is a phospholipid bilayer with embedded proteins that regulate the movement of substances into and out of the cell.

Question 4

Which of the following is a function of channel proteins in the plasma membrane?

Accepted Answer

They form hydrophilic pathways that allow specific ions and molecules to cross the hydrophobic center of the membrane.

Question 5

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

Accepted Answer

A membrane-enclosed nucleus

Question 6

Which of the following best describes the main difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have membrane-enclosed organelles, including a nucleus, while prokaryotic cells do not.

Question 7

A mutation causes a cell to produce defective lysosomes. Which of the following is a likely consequence?

Accepted Answer

The cell will accumulate undigested materials, leading to cellular dysfunction.

Question 8

Which organelle is primarily responsible for the synthesis of lipids and detoxification of harmful substances in liver cells?

Accepted Answer

Smooth endoplasmic reticulum

Question 9

A plant cell is placed in a hypotonic solution. Which structure helps prevent the cell from bursting?

Accepted Answer

Cell wall

Question 10

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

Accepted Answer

It modifies, sorts, and packages proteins and lipids for storage or transport out of the cell.

Question 11

A cell is observed to have a large central vacuole, chloroplasts, and a cell wall. Which type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 12

Which of the following equations correctly represents the surface area-to-volume ratio for a cube-shaped cell with side length $s$?

Accepted Answer

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

Question 13

Which of the following is a function of the cytoskeleton in eukaryotic cells?

Accepted Answer

Maintaining cell shape, enabling movement, and facilitating intracellular transport

Question 14

Which of the following best explains why mitochondria and chloroplasts are considered energy-processing organelles?

Accepted Answer

Mitochondria convert chemical energy from food into ATP, while chloroplasts convert solar energy into chemical energy.

Question 15

Which of the following scenarios best illustrates the function of tight junctions in animal tissues?

Accepted Answer

Preventing leakage of digestive enzymes between cells lining the stomach

Question 16

A mutation disrupts the function of integrins in a cell. Which process would be most directly affected?

Accepted Answer

Communication between the extracellular matrix and the cytoskeleton

Question 17

Which of the following best describes the role of ribosomes in the cell?

Accepted Answer

They synthesize proteins according to instructions from mRNA.

Question 18

Which of the following is a key difference between the rough and smooth endoplasmic reticulum?

Accepted Answer

The rough ER has ribosomes on its surface and synthesizes proteins, while the smooth ER lacks ribosomes and synthesizes lipids.

Question 19

Which of the following best describes the function of plasmodesmata in plant cells?

Accepted Answer

They allow water, nutrients, and chemical messages to pass between adjacent plant cells.

Question 20

A patient has a genetic disorder that affects the structure of collagen fibers in the extracellular matrix. Which tissue function is most likely to be impaired?

Accepted Answer

The ability of cells to stick together and maintain tissue integrity

General Biology: Chapter 4 – Cell Structure and Function

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