Question 1

Which of the following statements best describes the structure and function of the eukaryotic flagellum compared to the bacterial flagellum?

Accepted Answer

Eukaryotic flagella are about ten times thicker, structurally more complex, and are covered by an extension of the cell membrane.

Question 2

A scientist is studying a eukaryotic cell with a rigid outer layer composed of polysaccharides such as chitin. What is the primary function of this structure?

Accepted Answer

To provide rigidity and structural support to the cell.

Question 3

Which of the following best explains why the eukaryotic cytoplasmic membrane is described as 'selectively permeable'?

Accepted Answer

It allows certain molecules to pass while restricting others, due to its composition of phospholipids, proteins, and sterols.

Question 4

A cell biologist observes a eukaryotic organelle that contains circular DNA and 70S ribosomes. Which organelle is being observed, and what is its primary function?

Accepted Answer

Mitochondrion; generates energy for the cell through aerobic respiration.

Question 5

Which of the following best describes the function of the rough endoplasmic reticulum (RER) in a eukaryotic cell?

Accepted Answer

Transports materials from the nucleus to the cytoplasm and to the cell's exterior, with ribosomes attached to its surface.

Question 6

A patient is diagnosed with a fungal infection. Which of the following is a likely reason why opportunistic fungal infections are becoming a growing threat to public health?

Accepted Answer

There is an increasing population of immunocompromised individuals and climate change is altering fungal habitats.

Question 7

Which of the following is NOT a benefit provided by fungi in natural or industrial processes?

Accepted Answer

Fungi form stable associations with plant roots, increasing nutrient absorption.

Question 8

A microbiologist is examining a unicellular organism that moves using pseudopods and is found in freshwater. To which group does this organism most likely belong?

Accepted Answer

Protozoa, specifically amoeboid protozoa.

Question 9

Which of the following best describes the function of lysosomes in eukaryotic cells?

Accepted Answer

They build off the Golgi apparatus and participate in the intracellular digestion of food particles and protection against invading microorganisms.

Question 10

A protozoan is observed in two stages: a motile, feeding stage and a dormant, resistant stage. What are the correct terms for these stages?

Accepted Answer

Trophozoite (motile, feeding) and cyst (dormant, resistant).

Question 11

Which of the following best explains why some protozoan cysts are important in the spread of disease?

Accepted Answer

Cysts are resistant to heat, drying, and chemicals, allowing them to survive in contaminated food, water, and on surfaces.

Question 12

A sample contains a eukaryotic cell with large and small ribosomal subunits (60S and 40S). What is the total size of the eukaryotic ribosome, and what is its main function?

Accepted Answer

80S; synthesizing proteins.

Question 13

Which of the following best describes the reproductive strategy of yeasts?

Accepted Answer

Yeasts reproduce asexually by budding, where a parent cell builds a daughter cell that then falls off.

Question 14

A patient is infected with a helminth that has an elongated, cylindrical, unsegmented body. To which group does this helminth most likely belong?

Accepted Answer

Roundworms (Phylum Aschelminthes).

Question 15

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

Accepted Answer

It modifies proteins by adding polysaccharides and lipids, then packages them into vesicles for transport.

Question 16

A multicellular animal parasite is found to have a highly developed reproductive tract but reduced digestive, excretory, and muscular systems. What is the most likely explanation for this adaptation?

Accepted Answer

The parasite relies on its host for nutrition and focuses energy on reproduction to ensure survival.

Question 17

Which of the following best describes the role of the nucleolus within the eukaryotic nucleus?

Accepted Answer

It is the site for ribosomal RNA synthesis and the collection area for ribosomal subunits.

Question 18

A fungal colony is observed to have both vegetative hyphae and reproductive/aerial hyphae. What does this indicate about the fungus?

Accepted Answer

It is a mold, capable of both visible growth and spore production.

Question 19

Which of the following best explains why mitochondria are considered unique among eukaryotic organelles?

Accepted Answer

They contain circular DNA, have bacteria-sized 70S ribosomes, and divide independently of the cell.

Question 20

A protozoan parasite is transmitted to humans through contaminated water and survives harsh environmental conditions outside the host. Which stage is responsible for this transmission?

Accepted Answer

Cyst stage, which is dormant and resistant to heat, drying, and chemicals.

Eukaryotic Cells and Microorganisms: Structure and Diversity

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