Question 1

Which of the following best explains why cells are considered the fundamental units of life?

Accepted Answer

Cells are the smallest units that can carry out all activities required for life.

Question 2

A scientist wants to observe the detailed internal structure of a mitochondrion. Which type of microscope should they use, and why?

Accepted Answer

Transmission electron microscope (TEM), because it can resolve structures as small as $$0.002\ \mu m.$$

Question 3

If a cell is $$20\ \mu m in $$diameter and a scale bar on a micrograph represents $$5\ \mu m as$$ $$1\ 	ext{cm}$$, what is the diameter of the cell on the micrograph?

Accepted Answer

$$4\ 	ext{cm}$$

Question 4

Which of the following statements about eukaryotic and prokaryotic cells is correct?

Accepted Answer

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

Question 5

A researcher is studying a cell that contains chloroplasts, a nucleus, and a cell wall. Which type of organism is this cell most likely from?

Accepted Answer

A plant

Question 6

Which of the following best describes the function of ribosomes in a cell?

Accepted Answer

Synthesizing proteins by translating genetic instructions from mRNA

Question 7

Why are most cells microscopic in size rather than much larger?

Accepted Answer

A high surface area-to-volume ratio allows efficient exchange of materials with the environment.

Question 8

Which of the following is a function of the endomembrane system in eukaryotic cells?

Accepted Answer

Transporting proteins and lipids within the cell

Question 9

A student observes a cell under a microscope and notes the presence of a plasma membrane, cytoplasm, and DNA, but no nucleus. Which type of cell is this most likely to be?

Accepted Answer

A prokaryotic cell

Question 10

If the magnification of a microscope is $$400	imes$$ and the actual size of a cell is $$10\ \mu m$$, what is the apparent size of the cell in the image?

Accepted Answer

$$4\ 	ext{mm}$$

Question 11

Which of the following best explains why electron microscopes can resolve much smaller structures than light microscopes?

Accepted Answer

Electrons have much shorter wavelengths than visible light, allowing higher resolution.

Question 12

Which of the following is NOT a component of the endomembrane system?

Accepted Answer

Mitochondria

Question 13

A cell biologist wants to study the surface features of a pollen grain. Which type of microscopy should they use?

Accepted Answer

Scanning electron microscopy (SEM)

Question 14

Which of the following best describes the relationship between structure and function in biological membranes?

Accepted Answer

The phospholipid bilayer provides a semi-permeable barrier that regulates the movement of substances in and out of the cell.

Question 15

Which of the following is a real-world application of using a scale bar in microscopy?

Accepted Answer

Estimating the size of a bacterial cell to determine the appropriate antibiotic dosage

Question 16

Which of the following statements about the history of microscopy is correct?

Accepted Answer

The invention of the light microscope allowed scientists to discover and study cells for the first time.

Question 17

Which of the following best explains why multicellular organisms require specialized cells?

Accepted Answer

Specialized cells perform specific functions that contribute to the survival of the organism as a whole.

Question 18

A mutation causes a cell to lose its ability to produce lysosomes. Which of the following would most likely result?

Accepted Answer

The cell would accumulate undigested macromolecules and cellular debris.

Question 19

Which of the following best describes the role of extracellular components in animal tissues?

Accepted Answer

They help coordinate cellular activities and provide structural support.

Question 20

If a chicken egg is approximately $$4\ 	ext{cm} in $$diameter, and a typical animal cell is $$20\ \mu m in $$diameter, how many animal cells could fit across the diameter of the egg (assuming no space between cells)?

Accepted Answer

$$2000$$

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

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