Question 1

Which of the following best describes the primary function of a Scanning Electron Microscope (SEM)?

Accepted Answer

To visualize external cell surfaces and structures on the outside surface of cells.

Question 2

A scientist wants to study the detailed internal structure of mitochondria within a cell. Which type of microscope should they use?

Accepted Answer

Transmission Electron Microscope (TEM)

Question 3

Why must dead specimens be used with Transmission Electron Microscopes (TEM)?

Accepted Answer

Because the preparation process involves vacuum conditions and staining with heavy metals, which are not compatible with living cells.

Question 4

Which of the following best describes the purpose of a compound light microscope?

Accepted Answer

To magnify small objects using visible light, allowing for the visualization of cells and other small structures.

Question 5

A student observes cilia on the surface of a cell in high detail. Which type of microscope most likely produced this image?

Accepted Answer

Scanning Electron Microscope (SEM)

Question 6

A magnifying glass is an example of which type of microscope?

Accepted Answer

Simple Light Microscope

Question 7

Which of the following statements about immersion oil is correct?

Accepted Answer

Immersion oil is used with high-power objective lenses to increase the resolution by reducing light refraction.

Question 8

Cells were first observed through which type of microscope?

Accepted Answer

Simple Light Microscope

Question 9

Which of the following is a common application of a wet mount preparation in microscopy?

Accepted Answer

Observing live specimens, such as microorganisms, in their natural state.

Question 10

What is the type of stain method where the dye sticks to the specimen and gives it color?

Accepted Answer

Positive stain

Question 11

A researcher wants to visualize the three-dimensional surface of a pollen grain. Which microscope should they use and why?

Accepted Answer

Scanning Electron Microscope (SEM), because it produces detailed 3D images of external surfaces.

Question 12

Which of the following best explains why a wet mount is preferred for observing living microorganisms?

Accepted Answer

It keeps the specimen in its natural, hydrated state, allowing observation of movement and behavior.

Question 13

A biologist is preparing a sample for TEM. Which of the following steps is essential in this process?

Accepted Answer

Staining the sample with heavy metals and placing it in a vacuum.

Question 14

Which microscope would be most appropriate for observing the movement of live bacteria in a drop of pond water?

Accepted Answer

Compound Light Microscope with a wet mount

Question 15

Which of the following statements about positive staining is correct?

Accepted Answer

The dye sticks to the specimen and gives it color.

Question 16

A student is using a compound light microscope with a 100x oil immersion lens. What is the main reason for using immersion oil in this context?

Accepted Answer

To reduce light refraction and increase resolution.

Question 17

Which of the following best describes the difference between SEM and TEM?

Accepted Answer

SEM visualizes external surfaces, while TEM visualizes internal structures.

Question 18

Which type of microscope would be best for mapping the atomic structure of a metal surface?

Accepted Answer

Scanning Tunneling Microscope (STM)

Question 19

A scientist wants to observe the flagella of a bacterium in motion. Which preparation and microscope combination is most appropriate?

Accepted Answer

Wet mount with a compound light microscope

Question 20

Which of the following is a limitation of using electron microscopes for biological specimens?

Accepted Answer

They require specimens to be dead due to the preparation process.

Microscopy in Biology: Types, Uses, and Techniques

Study Guide - Practice Questions