Question 1

Which of the following statements best describes the main difference between the reproduction of eukaryotes and prokaryotes?

Accepted Answer

Eukaryotic reproduction is more complicated, involving both sexual and asexual methods, and most eukaryotic DNA is packaged as chromosomes in a nucleus.

Question 2

A scientist discovers a unicellular organism that lacks a cell wall, is motile by means of flagella, and requires a moist environment. Which group does this organism most likely belong to?

Accepted Answer

Protozoa

Question 3

Which of the following best explains why modern classification of eukaryotic organisms has shifted from structural similarities to nucleotide sequence similarities?

Accepted Answer

Nucleotide sequences provide a more accurate reflection of evolutionary relationships among organisms.

Question 4

Which of the following is a correct pairing of a protozoan group and a unique feature?

Accepted Answer

Parabasala – have a parabasal body and lack mitochondria

Question 5

A patient presents with bloody diarrhea. Microscopic examination reveals an amoeba with lobe-shaped pseudopods and no shell. Which organism is most likely responsible?

Accepted Answer

Entamoeba histolytica

Question 6

Which of the following best describes the nutritional mode of most fungi?

Accepted Answer

Chemoheterotrophic, acquiring nutrients by absorption

Question 7

Which of the following statements about fungal reproduction is correct?

Accepted Answer

Fungi can reproduce both sexually and asexually, with asexual reproduction involving mitosis and cytokinesis.

Question 8

A researcher is studying a marine organism with ornate silica shells and threadlike pseudopods. To which group does this organism most likely belong?

Accepted Answer

Rhizaria (Radiolaria)

Question 9

Which of the following is a significant ecological role of fungi?

Accepted Answer

Decomposing dead organisms and recycling nutrients

Question 10

Which of the following best describes the relationship in lichens?

Accepted Answer

A partnership between a fungus and a photosynthetic microbe, where the fungus provides nutrients, water, and protection, and the microbe provides carbohydrates and oxygen.

Question 11

Which of the following is a correct match between an algal group and a unique feature?

Accepted Answer

Rhodophyta – use glycogen as a storage molecule and have cell walls of agar or carrageenan

Question 12

A sample from a freshwater pond contains unicellular, filamentous organisms with chlorophylls a and b, and cell walls of cellulose. Which group do these organisms most likely belong to?

Accepted Answer

Chlorophyta (green algae)

Question 13

Which of the following is a correct statement about the storage products of different algal groups?

Accepted Answer

Rhodophyta use glycogen as a storage molecule.

Question 14

Which of the following best describes the role of apicomplexans among protozoa?

Accepted Answer

They are chemoheterotrophic pathogens of animals, with organelles that allow them to penetrate host cells.

Question 15

A patient is diagnosed with trichomoniasis. Which of the following features would you expect to find in the causative organism?

Accepted Answer

Lack of mitochondria, presence of a parabasal body, and a single nucleus

Question 16

Which of the following is a correct statement about the vectors of disease among arthropods?

Accepted Answer

Mosquitoes are the most important arthropod vectors of disease.

Question 17

Which of the following equations correctly represents the ploidy of a diploid eukaryotic cell?

Accepted Answer

$$2n$$

Question 18

A fungus is observed to produce both yeastlike and moldlike forms depending on environmental conditions. What is the term for this phenomenon?

Accepted Answer

Dimorphism

Question 19

Which of the following best explains why diatoms are ecologically important?

Accepted Answer

They are a major source of the world’s oxygen and a component of marine phytoplankton.

Question 20

Which of the following is a correct statement about the cell wall composition of fungi?

Accepted Answer

Fungal cell walls are typically composed of chitin.

Characteristics and Classification of Eukaryotic Microorganisms

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