Question 1

Which of the following best explains why bacteria are generally small in size compared to eukaryotic cells?

Accepted Answer

Smaller size increases the surface area-to-volume ratio, allowing for more efficient nutrient uptake and waste removal.

Question 2

A spherical bacterium has a radius of $$r = 1 \ \mu m. $$What is its surface area-to-volume ratio? (Surface area of a sphere: $$4\pi r^2$, Volume: $$\frac{4}{3}\pi $$r^3)$$

Accepted Answer

$$\frac{3}{r}$$

Question 3

Which of the following is a key structural difference between prokaryotic and eukaryotic cells?

Accepted Answer

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

Question 4

Which of the following best describes the cell wall composition of Archaea?

Accepted Answer

Archaea have cell walls that lack peptidoglycan.

Question 5

A patient is diagnosed with a disease caused by Borrelia burgdorferi. Which of the following statements is correct regarding this organism?

Accepted Answer

It is a spirochete bacterium responsible for Lyme disease.

Question 6

Which of the following is NOT a property of viruses?

Accepted Answer

They can reproduce independently outside of a host cell.

Question 7

Which of the following best describes prions?

Accepted Answer

Infectious misfolded proteins that cause neurodegenerative diseases.

Question 8

Which of the following cell morphologies is correctly matched with its description?

Accepted Answer

Bacillus: rod-shaped

Question 9

Which of the following statements about extremophiles is correct?

Accepted Answer

They are often archaea that thrive in extreme environments such as high temperature or salinity.

Question 10

Which of the following is a function of the bacterial cell wall?

Accepted Answer

Provides structural support and determines cell shape.

Question 11

A scientist observes a microorganism with a nucleus, mitochondria, and a cell wall made of chitin. Which group does this organism most likely belong to?

Accepted Answer

Fungi

Question 12

Which of the following best explains why surface area-to-volume ratio is important for microbial cells?

Accepted Answer

A higher surface area-to-volume ratio allows for more efficient exchange of nutrients and waste products.

Question 13

Which of the following statements about eukaryotic microorganisms is correct?

Accepted Answer

Algae, fungi, protozoa, and helminths are all eukaryotic microorganisms.

Question 14

Which of the following is a unique feature of bacterial cell walls compared to eukaryotic cell walls?

Accepted Answer

Presence of peptidoglycan

Question 15

A microbiologist is studying a microbe that is motile, lacks a nucleus, and has a cell wall containing peptidoglycan. Which group does this organism most likely belong to?

Accepted Answer

Bacteria

Question 16

Which of the following best describes the genetic material of viruses?

Accepted Answer

Viruses contain either DNA or RNA, but never both.

Question 17

Which of the following is a correct statement about colony morphology?

Accepted Answer

Colony morphology can help distinguish between different species of bacteria.

Question 18

Which of the following is a correct comparison between pathogenic and non-pathogenic bacteria?

Accepted Answer

Pathogenic bacteria cause disease in hosts, while non-pathogenic bacteria do not.

Question 19

Which of the following statements about protozoa is correct?

Accepted Answer

Protozoa are eukaryotes that are able to ingest organic chemicals and may be motile.

Question 20

Which of the following best explains why bacterial shape and size can play an important role in pathogenicity?

Accepted Answer

Shape and size can affect how bacteria interact with host tissues and evade the immune system.

Microbial Size, Shape, and Diversity: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards