Question 1

Which of the following statements best supports the endosymbiotic theory for the origin of mitochondria and chloroplasts in eukaryotic cells?

Accepted Answer

Both organelles replicate independently using a process similar to binary fission and contain circular DNA.

Question 2

A scientist observes a eukaryotic cell with a thick cell wall composed primarily of chitin. Which type of organism is this cell most likely from?

Accepted Answer

Fungus

Question 3

Which process is described by the following sequence: a cell engulfs a bacterium, forms a phagosome, fuses it with a lysosome, digests the bacterium, and then expels the waste?

Accepted Answer

Phagocytosis followed by exocytosis

Question 4

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

Accepted Answer

They move with a whip-like motion and are made of tubulin.

Question 5

A patient presents with a respiratory infection after visiting the Mississippi River valley. Lab results show a fungus that survives in macrophages and is associated with bird and bat droppings. Which pathogen is most likely responsible?

Accepted Answer

Histoplasma capsulatum

Question 6

Which of the following best describes the function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Site of protein modification and packaging into vesicles

Question 7

Which type of fungal spore is produced by mitosis and does NOT result in genetic variation?

Accepted Answer

Conidiospore

Question 8

Which of the following is a correct statement about the cytoskeleton in eukaryotic cells?

Accepted Answer

It is responsible for anchoring organelles and permitting shape changes.

Question 9

Which of the following best explains why antifungal drugs are generally ineffective against Pneumocystis jirovecii?

Accepted Answer

It lacks ergosterol in its cell membrane, the target of most antifungals.

Question 10

Which of the following is a distinguishing feature of thermal dimorphic fungi?

Accepted Answer

They can switch between yeast and mold forms depending on temperature.

Question 11

Which of the following is a function of the glycocalyx in eukaryotic cells?

Accepted Answer

Protection, adherence, and cell communication

Question 12

Which of the following best describes the nutritional strategy of fungi?

Accepted Answer

Absorptive chemoheterotrophs that secrete enzymes to digest substrates

Question 13

Which of the following is a major ecological role of algae?

Accepted Answer

Major producers of oxygen and food for aquatic ecosystems

Question 14

A protozoan is observed to have both a macronucleus and a micronucleus. Which of the following is most likely true about this organism?

Accepted Answer

It is a ciliated protozoan.

Question 15

Which of the following best describes the difference between asexual and sexual fungal spores?

Accepted Answer

Sexual spores arise from meiosis and result in genetic variation.

Question 16

Which of the following is a correct pairing of a fungal pathogen and its associated disease?

Accepted Answer

Coccidioides immitis – Coccidioidomycosis

Question 17

Which of the following is a characteristic of protozoan cysts?

Accepted Answer

They are dormant, resistant forms that help protozoa survive harsh conditions.

Question 18

Which of the following best explains why dinoflagellate blooms (red tides) can be dangerous to humans?

Accepted Answer

They produce neurotoxins that can accumulate in shellfish and poison humans who eat them.

Question 19

Which of the following is a correct statement about eukaryotic ribosomes?

Accepted Answer

They are 80S in the cytoplasm, but mitochondria and chloroplasts contain 70S ribosomes.

Eukaryotic Cells and Eukaryotic Microorganisms: Structure, Function, and Diversity

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