Question 1

Which of the following best describes the main advantage of using a transmission electron microscope (TEM) over a light microscope when studying cells?

Accepted Answer

TEMs offer much higher resolution, allowing visualization of internal subcellular structures.

Question 2

A student is using a light microscope with a 40x objective lens and a 10x ocular lens. What is the total magnification being used?

Accepted Answer

$40 	imes 10 = 400$

Question 3

Which parameter of microscopy determines the minimum distance at which two points can be distinguished as separate?

Accepted Answer

Resolution

Question 4

Why are most organelles in eukaryotic cells not visible under a standard light microscope?

Accepted Answer

Their size is below the resolution limit of light microscopes.

Question 5

A scientist wants to study the 3D surface structure of a bacterium. Which type of microscope should they use and why?

Accepted Answer

Scanning electron microscope, because it scans the surface and produces 3D images.

Question 6

Which of the following is NOT a feature shared by all cells (prokaryotic and eukaryotic)?

Accepted Answer

Membrane-bound nucleus

Question 7

If a cube-shaped cell increases its length from 1 unit to 2 units, how does its surface area to volume ratio change?

Accepted Answer

It decreases from $6:1$ to $3:1$

Question 8

Which of the following statements about prokaryotic cells is correct?

Accepted Answer

Their DNA is located in an unbound region called the nucleoid.

Question 9

A researcher stains a sample to increase the visible differences in brightness between parts of a cell. Which microscopy parameter is being enhanced?

Accepted Answer

Contrast

Question 10

Why do eukaryotic cells have internal membranes that compartmentalize their functions?

Accepted Answer

To allow incompatible metabolic processes to occur simultaneously in different compartments.

Question 11

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

Accepted Answer

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

Question 12

A scientist is comparing a plant cell and a bacterial cell. Which of the following is found in both cell types?

Accepted Answer

Ribosomes

Question 13

Which of the following is a correct statement about the plasma membrane?

Accepted Answer

It is a selective barrier that regulates the passage of materials into and out of the cell.

Question 14

A cube-shaped cell has a surface area of $150$ units$^2$ and a volume of $125$ units$^3$. What is its surface area to volume ratio?

Accepted Answer

$1.2$

Question 15

Which of the following is a unique feature of eukaryotic cells compared to prokaryotic cells?

Accepted Answer

Presence of membrane-bound organelles

Question 16

A medical researcher needs to observe the arrangement of proteins within a virus particle. Which microscope should they use and why?

Accepted Answer

Transmission electron microscope, because it has the resolution to visualize proteins and internal structures.

Question 17

Which of the following best explains why dyes are often used in light microscopy?

Accepted Answer

To enhance the contrast between different parts of the sample.

Question 18

Which of the following is a correct comparison between scanning electron microscopes (SEMs) and transmission electron microscopes (TEMs)?

Accepted Answer

SEMs produce 3D images of surfaces, while TEMs provide detailed images of internal structures.

Microscopy and Cell Structure in General Biology

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