Question 1

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

Accepted Answer

Circular chromosome

Question 2

A scientist discovers a microorganism with the following characteristics: it is unicellular, has a flexible cytoskeleton, moves using a long flagellum, and can photosynthesize as well as ingest food. To which group does this organism most likely belong?

Accepted Answer

Euglenozoans

Question 3

Which of the following statements about Gram-negative bacteria is correct?

Accepted Answer

They are more resistant to antibiotics due to their outer membrane.

Question 4

Which of the following best explains why it is important to study microbial diversity?

Accepted Answer

Microbes play essential roles in ecosystems, biotechnology, and human health.

Question 5

A sample contains cells with the following features: cell walls made of chitin, eukaryotic cell structure, and absorptive heterotrophy. Which kingdom do these organisms belong to?

Accepted Answer

Fungi

Question 6

Which of the following groups is characterized by being photoautotrophic, having cell walls made of cellulose, and being multicellular?

Accepted Answer

Plants

Question 7

A bacterium is observed to be spherical in shape and forms clusters. What is the correct term for this shape and arrangement?

Accepted Answer

Coccus, clusters

Question 8

Which of the following nutritional modes is unique to prokaryotes and involves using inorganic chemicals as an energy source and $$\mathrm{CO_2$} as a $$carbon source?

Accepted Answer

Chemoautotrophy

Question 9

Which of the following is NOT a characteristic of animals?

Accepted Answer

Cell walls made of cellulose

Question 10

A patient is diagnosed with malaria, a disease caused by Plasmodium. Which of the following statements about Plasmodium is correct?

Accepted Answer

It is a protist with a complex life cycle involving both mosquito and human hosts.

Question 11

Which of the following best describes the alternation of generations in green algae?

Accepted Answer

A life cycle alternating between multicellular haploid and multicellular diploid stages

Question 12

Which of the following is a key difference between the cell walls of bacteria and fungi?

Accepted Answer

Bacterial cell walls contain peptidoglycan, while fungal cell walls contain chitin.

Question 13

Which of the following statements about protists is correct?

Accepted Answer

Protists are a diverse group of eukaryotes that are not animals, plants, or fungi.

Question 14

A researcher is studying a microorganism that has a contractile vacuole, two types of nuclei, and moves using cilia. Which group does this organism most likely belong to?

Accepted Answer

Ciliates

Question 15

Which of the following is a correct pairing of a group and its nutritional mode?

Accepted Answer

Fungi – absorptive heterotrophy

Question 16

Which of the following best describes the genetic material in prokaryotes?

Accepted Answer

Circular chromosome located in the nucleoid region

Question 17

Which of the following is a real-world example of the importance of microbial diversity in human health?

Accepted Answer

The human gut microbiome aids in digestion and protects against pathogens.

Question 18

Which of the following is a characteristic of archaea that distinguishes them from bacteria?

Accepted Answer

Branched hydrocarbons in membrane lipids

Question 19

A student observes a microorganism under the microscope and notes that it is single-celled, has pseudopodia for movement, and lacks a cell wall. Which group does this organism most likely belong to?

Accepted Answer

Amoebozoans

Question 20

Which of the following best explains why Gram-negative bacteria are often more difficult to treat with antibiotics than Gram-positive bacteria?

Accepted Answer

They possess an outer membrane that restricts antibiotic entry.

Biodiversity of Microorganisms: Traits and Classification

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