Question 1

According to the cell theory, which of the following statements is NOT correct?

Accepted Answer

Some living organisms are not made of cells.

Question 2

Which of the following best describes the main limitation of light microscopy compared to electron microscopy?

Accepted Answer

Light microscopes have a lower resolution, limited to about $$0.2\ \mu m$$ due to the wavelength of visible light.

Question 3

A scientist wants to observe the detailed structure of ribosomes inside a bacterial cell. Which type of microscopy should they use and why?

Accepted Answer

Transmission electron microscopy, because it can resolve structures down to $$0.2\ nm$$ and is ideal for internal cell details.

Question 4

Which of the following is a unique feature of plant cells compared to animal cells?

Accepted Answer

Presence of a large central vacuole and chloroplasts.

Question 5

A cell is observed to have no membrane-bound organelles and no nuclear envelope. Which type of cell is this most likely to be?

Accepted Answer

Bacterial cell

Question 6

If the resolution of a light microscope is $$0.2\ \mu m$$, what is the smallest structure it can distinguish?

Accepted Answer

A mitochondrion with a diameter of $$0.5\ \mu m$$

Question 7

Which of the following best explains why electron microscopes have a higher resolution than light microscopes?

Accepted Answer

Electrons have a much shorter wavelength than visible light.

Question 8

A researcher is using a microscope to observe the movement of cilia on a living cell. Which type of microscopy is most appropriate for this observation?

Accepted Answer

Phase contrast microscopy

Question 9

Which of the following structures is present in animal cells but not in most plant cells?

Accepted Answer

Centrioles

Question 10

A student is asked to calculate the actual size of a cell observed under a light microscope. The cell appears to be $$2\ mm$$ long at $$400	imes$$ magnification. What is the actual size of the cell?

Accepted Answer

$$5\ \mu m$$

Question 11

Which of the following best describes the function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles

Question 12

Which of the following is a correct statement about the evolutionary relationship among Bacteria, Archaea, and Eukarya?

Accepted Answer

Bacteria, Archaea, and Eukarya all evolved from a single ancestral cell.

Question 13

Which of the following is a correct match between a cell structure and its function?

Accepted Answer

Chloroplast – site of photosynthesis in plant cells

Question 14

A scientist is using a confocal microscope to study a fluorescently labeled protein in a cell. What is the main advantage of confocal microscopy in this experiment?

Accepted Answer

It eliminates out-of-focus light, producing sharper images of specific cell layers.

Question 15

Which of the following best explains why plant cells are generally more rigid than animal cells?

Accepted Answer

Plant cells have a cell wall made of cellulose that provides structural support.

Question 16

Which of the following is the correct order of steps in the scientific method as shown in the provided diagram?

Accepted Answer

Make initial observations → Formulate a testable hypothesis → Design a controlled experiment → Collect data → Interpret results → Accept or reject hypothesis

Question 17

A cell is observed to have a plasma membrane, ribosomes, and a nucleoid region, but no membrane-bound organelles. Which domain does this cell most likely belong to?

Accepted Answer

Bacteria

Question 18

Which of the following metric prefixes represents $$10^{-9}$$?

Accepted Answer

nano (n)

Question 19

Which of the following best describes the function of cilia and flagella in eukaryotic cells?

Accepted Answer

They are responsible for cell movement and locomotion.

Cell Theory, Microscopy, and Cell Types: Foundational Concepts in Cell Biology

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