Q: Which of the following metric conversions is correct?

$$1\ \text{meter} = 10^6$\ \text{micrometers}$$

Question 1

Which statement best summarizes the cell theory as developed in the mid-1800s?

Accepted Answer

All living things are made up of cells, cells are the basic units of structure and function, and all cells come from pre-existing cells.

Question 2

Robert Hooke is credited with which major scientific discovery?

Accepted Answer

He was the first to observe and name cells using a light microscope.

Question 3

A biologist is using a microscope to view a specimen. If the microscope has a magnification of $$400	imes$$ and a resolution of $$0.2\ \mu m$$, what does the resolution value indicate?

Accepted Answer

The minimum distance between two points that can still be distinguished as separate.

Question 4

Which of the following metric conversions is correct?

Accepted Answer

$$1\ 	ext{meter} = 10^6$\ 	ext{micrometers}$$

Question 5

Which type of microscope would be best for observing the internal ultrastructure of a cell, and what is a major limitation of this method?

Accepted Answer

Transmission electron microscope; specimen preparation kills the cell and may introduce artifacts.

Question 6

A scientist wants to observe live cells in action. Which microscope should they use and why?

Accepted Answer

Light microscope, because it allows observation of living specimens.

Question 7

If a cell is measured to be $$0.01\ 	ext{mm} in $$diameter, what is its diameter in micrometers ($$\mu m$$)?

Accepted Answer

$$10\ \mu m$$

Question 8

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

Accepted Answer

DNA located in a nucleoid region rather than a nucleus.

Question 9

A student claims that all cells have the same shape and size. Which evidence from cell biology contradicts this statement?

Accepted Answer

Cells vary in size and shape depending on their function and type.

Question 10

Which of the following best describes the difference between magnification and resolution in microscopy?

Accepted Answer

Magnification is how big an object appears compared to its actual size; resolution is how clear an object appears.

Question 11

If a scientist needs to measure the diameter of a virus that is $$100\ 	ext{nm}$$, which metric unit is most appropriate?

Accepted Answer

Nanometer (nm)

Question 12

Which of the following statements is true regarding the preparation of specimens for electron microscopy?

Accepted Answer

Specimens must be coated with heavy metals and are often killed during preparation.

Question 13

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

Accepted Answer

Plant cell

Question 14

Which of the following is NOT a component of the cell theory?

Accepted Answer

All cells contain DNA.

Question 15

If $$1\ 	ext{meter} = 10^9$\ 	ext{nanometers}$$, how many nanometers are in $$0.5\ 	ext{meters}$$?

Accepted Answer

$$5 	imes 10^8$\ 	ext{nanometers}$$

Question 16

Which of the following is a limitation of using a scanning electron microscope (SEM)?

Accepted Answer

It provides only a 2-D image and requires specimens to be coated with heavy metals.

Question 17

A researcher wants to compare the sizes of a human egg ($$100\ \mu m$$), a bacterium ($$1\ \mu m$$), and a virus ($$0.1\ \mu m). $$Which statement is correct?

Accepted Answer

The human egg is much larger than both the bacterium and the virus.

Question 18

Which of the following best explains why most cells are microscopic?

Accepted Answer

Large cells cannot efficiently exchange materials with their environment due to a decreased surface area-to-volume ratio.

Question 19

Which of the following is a correct statement about eukaryotic cells?

Accepted Answer

They have membrane-bound organelles and a true nucleus.

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

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