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 higher surface area-to-volume ratio, which facilitates efficient exchange of materials across the plasma membrane.

Question 2

A scientist is using a microscope to study the detailed architecture of a cell's surface. Which type of microscope should they use and why?

Accepted Answer

A scanning electron microscope (SEM), because it provides high-resolution images of cell surfaces.

Question 3

Which statement is a key tenet of the Cell Theory as described in the study materials?

Accepted Answer

All living things are composed of cells and all cells come from other cells.

Question 4

A micrograph shows cells stained with different dyes to highlight various structures. What is the primary purpose of using differential staining in microscopy?

Accepted Answer

To increase contrast and allow visualization of specific cellular components.

Question 5

Which of the following best describes the structure of the plasma membrane as shown in the study materials?

Accepted Answer

A phospholipid bilayer with embedded proteins.

Question 6

A researcher wants to study the internal structure of mitochondria in detail. Which microscope should they use and why?

Accepted Answer

Transmission electron microscope (TEM), because it provides detailed images of internal cell structures.

Question 7

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

Accepted Answer

Synthesizing DNA for the cell.

Question 8

Which of the following correctly distinguishes between prokaryotic and eukaryotic cells?

Accepted Answer

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

Question 9

A cell is observed to have a plasma membrane, ribosomes, DNA, and no membrane-bound organelles. Which type of cell is this most likely to be?

Accepted Answer

A prokaryotic cell.

Question 10

Why is resolution considered the primary limitation of light microscopes?

Accepted Answer

Because the wavelength of visible light limits the smallest detail that can be distinguished.

Question 11

Which of the following best explains why cells must maintain a large surface area relative to their volume?

Accepted Answer

To maximize the efficiency of material exchange with the environment.

Question 12

A cell biologist is comparing the functions of different organelles. Which organelle is primarily responsible for genetic control of the cell?

Accepted Answer

Nucleus

Question 13

If a cell's plasma membrane were damaged and became leaky, which of the following would most likely occur?

Accepted Answer

The cell would lose its ability to regulate the movement of substances in and out, potentially leading to cell death.

Question 14

Which of the following is a real-world application of the use of electron microscopes in medicine?

Accepted Answer

Diagnosing cancer by observing the ultrastructure of tumor cells.

Question 15

A student observes a cell under a microscope and notes the presence of a cell wall, chloroplasts, and a large central vacuole. Which type of cell is this?

Accepted Answer

Plant cell

Question 16

Which of the following best describes the function of embedded proteins in the plasma membrane?

Accepted Answer

They assist in the transport of substances across the membrane.

Question 17

A cell is observed to be dividing uncontrollably, as seen in a micrograph of lung cancer cells. Which cellular process is most likely malfunctioning?

Accepted Answer

Regulation of the cell cycle.

Question 18

Which of the following equations correctly represents the surface area to volume ratio for a spherical cell of radius $$r$$?

Accepted Answer

$$ \frac{4 \pi r^2$}{\frac{4}{3} \pi r^3$} = \frac{3}{r} $$

Question 19

Which of the following is NOT one of the four basic groups of organelle functions in eukaryotic cells?

Accepted Answer

Photosynthetic pigment production.

Question 20

A patient is diagnosed with a genetic disorder that affects the structure of their plasma membrane. Which of the following cellular processes is most likely to be impaired?

Accepted Answer

Selective transport of molecules into and out of the cell.

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

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