Question 1

Which of the following best describes the difference between a compound light (brightfield) microscope and a transmission electron microscope (TEM)?

Accepted Answer

A compound light microscope uses visible light to illuminate specimens, while TEM uses electrons to visualize internal structures at much higher resolution.

Question 2

A bacterium moves toward a source of nutrients. Which term best describes this behavior?

Accepted Answer

Chemotaxis

Question 3

If an organism is 40 $$\mum in $$length, what is its length in millimeters?

Accepted Answer

0.04 mm

Question 4

Arrange the following from largest to smallest: bluebird, mosquito, white blood cell, Staphylococcus epidermidis, protein molecule. Which microscope would be used to view Staphylococcus epidermidis?

Accepted Answer

Compound light (brightfield) microscope

Question 5

Which of the following is NOT a characteristic that differentiates viruses from bacteria?

Accepted Answer

Viruses can reproduce independently, while bacteria require a host cell.

Question 6

Which of the following best describes the internal components of prokaryotic cells compared to eukaryotic cells?

Accepted Answer

Prokaryotic cells lack membrane-bound organelles, while eukaryotic cells contain membrane-bound organelles such as mitochondria and endoplasmic reticulum.

Question 7

Which bacterial cell wall component is unique to Gram-positive bacteria and absent in Gram-negative bacteria?

Accepted Answer

Thick peptidoglycan layer

Question 8

Which of the following best describes the function of fimbriae in bacteria?

Accepted Answer

Fimbriae help bacteria adhere to surfaces and other cells.

Question 9

A bacterial cell is observed to have a single flagellum at one end. Which flagellar arrangement does this represent?

Accepted Answer

Monotrichous

Question 10

Which of the following statements about Mycoplasma cell walls is correct?

Accepted Answer

Mycoplasma lack a cell wall entirely.

Question 11

Which structure is responsible for the transfer of genetic material between bacterial cells during conjugation?

Accepted Answer

Pili

Question 12

Which of the following is a function of the plasma membrane in prokaryotic cells?

Accepted Answer

Regulates the passage of substances into and out of the cell

Question 13

Which of the following best describes the structure of a bacterial flagellum?

Accepted Answer

A filament, hook, and basal body anchored in the cell membrane

Question 14

Which of the following arrangements describes cocci bacteria in chains?

Accepted Answer

Streptococci

Question 15

Which of the following is a distinguishing feature of Archaea cell walls compared to most bacteria?

Accepted Answer

Archaea cell walls lack peptidoglycan and may contain pseudopeptidoglycan.

Question 16

Which of the following is NOT a component of a typical virus?

Accepted Answer

Ribosomes

Question 17

Which of the following best describes the function of viral spikes?

Accepted Answer

Spikes facilitate attachment to host cells.

Question 18

Which of the following is a basic type of virus morphology?

Accepted Answer

Helical

Question 19

A white blood cell is approximately 10 $$\mum in $$diameter. Which microscope would be most appropriate for viewing its internal organelles?

Accepted Answer

Transmission electron microscope (TEM)

Question 20

Which of the following statements about endospores is correct?

Accepted Answer

Endospores are highly resistant structures formed by some bacteria to survive extreme conditions.

Microbiology Study Guide: Microscopy, Cell Structure, and Microbial Diversity

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