Question 1

Which of the following statements best explains why bacteria and archaea are classified into separate domains?

Accepted Answer

Because bacteria and archaea have significant genetic differences in their 16S ribosomal RNA sequences.

Question 2

A scientist discovers a unicellular organism with a rigid cell wall made of chitin, which absorbs nutrients from decaying organic matter. Which group does this organism most likely belong to?

Accepted Answer

Fungi

Question 3

Which of the following best describes the relationship in mycorrhizae?

Accepted Answer

A fungus increases a plant's ability to absorb water and minerals, while the plant supplies carbohydrates to the fungus.

Question 4

Which of the following is a key difference between algae and fungi?

Accepted Answer

Algae perform photosynthesis to make their own food, while fungi absorb nutrients from other organisms.

Question 5

Which of the following diseases is caused by a protozoan, and what is the causative agent?

Accepted Answer

Malaria, caused by Plasmodium species

Question 6

Which of the following statements about viruses, viroids, and prions is correct?

Accepted Answer

All three are acellular infectious agents that require a host cell for replication.

Question 7

A student is examining a microorganism that is unicellular, lacks a nucleus, and has a cell wall containing peptidoglycan. To which domain does this organism belong?

Accepted Answer

Domain Bacteria

Question 8

Which of the following best explains why helminths are studied in microbiology, even though adult helminths are visible to the naked eye?

Accepted Answer

Because their eggs and larvae are microscopic and they are important disease-causing organisms.

Question 9

Which of the following is a characteristic shared by both bacteria and fungi?

Accepted Answer

Both are decomposers and recycle nutrients in the environment.

Question 10

Which of the following statements about protozoa is correct?

Accepted Answer

Protozoa are unicellular eukaryotes that lack a cell wall and are usually heterotrophic.

Question 11

Which of the following best describes the structure of a prion?

Accepted Answer

A proteinaceous infectious particle with no nucleic acid.

Question 12

Which of the following is NOT a correct pairing of organism and its method of obtaining energy?

Accepted Answer

Protozoa – produce energy by photosynthesis

Question 13

A dimorphic fungus is best described as:

Accepted Answer

A fungus that can switch between unicellular and multicellular forms depending on environmental conditions.

Question 14

Which of the following is a correct statement about the evolutionary grouping of algae and protozoa?

Accepted Answer

Neither algae nor protozoa represent evolutionary groupings; both are diverse and do not share a single ancestor.

Question 15

Which of the following best describes the relationship in lichen?

Accepted Answer

A fungus and a photosynthetic partner, where the fungus provides protection and the partner provides carbohydrates.

Question 16

Which of the following is a key difference between helminths and bacteria?

Accepted Answer

Helminths are multicellular eukaryotes, while bacteria are unicellular prokaryotes.

Question 17

Which of the following is a correct statement about the three domains of life?

Accepted Answer

Domain Bacteria and Domain Archaea are both prokaryotic.

Question 18

Which of the following best explains why viruses are considered non-living?

Accepted Answer

They lack cellular structure and cannot metabolize or reproduce independently.

Question 19

A researcher is studying an organism that is eukaryotic, lacks true roots, stems, or leaves, and performs photosynthesis. Which group does this organism most likely belong to?

Accepted Answer

Algae

Question 20

Which of the following is a correct comparison between protozoa and bacteria?

Accepted Answer

Protozoa are eukaryotic and larger than bacteria, which are prokaryotic.

Microbiology: Types of Organisms and Infectious Agents – Guided Study Worksheet

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