Question 1

Which of the following provides the strongest evidence supporting the endosymbiotic theory for the origin of mitochondria and chloroplasts in eukaryotic cells?

Accepted Answer

Both organelles contain circular DNA and 70S ribosomes, similar to prokaryotes.

Question 2

A scientist observes a eukaryotic cell engulfing a large, undissolved particle. Which process is most likely occurring?

Accepted Answer

Phagocytosis

Question 3

Which of the following statements best distinguishes eukaryotic cell division by mitosis from prokaryotic binary fission?

Accepted Answer

Mitosis involves the separation of multiple linear chromosomes, while binary fission separates a single circular chromosome.

Question 4

Which of the following is a function of the smooth endoplasmic reticulum (ER) in eukaryotic cells?

Accepted Answer

Lipid production and detoxification of substances

Question 5

A patient presents with symptoms of seizures and psychosis after consuming contaminated rye. Which fungal toxin is most likely responsible?

Accepted Answer

Ergot toxin

Question 6

Which of the following structures is found in both mitochondria and chloroplasts, supporting their prokaryotic ancestry?

Accepted Answer

Double-membrane envelope

Question 7

Which type of fungal hyphae lacks cross-walls and appears as a continuous chain with many nuclei?

Accepted Answer

Aseptate hyphae

Question 8

A cell is observed to have a 9+2 arrangement of microtubules in its motility structure. Which structure is being described?

Accepted Answer

Eukaryotic flagellum

Question 9

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

Accepted Answer

Modification, sorting, and distribution of proteins and lipids

Question 10

Which of the following is a distinguishing feature of fungal asexual spores?

Accepted Answer

They arise from mitosis and are genetically identical to the parent.

Question 11

Which of the following eukaryotic cell structures is responsible for breaking down hydrogen peroxide and protecting the cell from oxidative damage?

Accepted Answer

Peroxisome

Question 12

A researcher is studying a unicellular organism that moves using pseudopods and causes dysentery in humans. Which organism is most likely being studied?

Accepted Answer

Entamoeba histolytica

Question 13

Which of the following statements about eukaryotic ribosomes is correct?

Accepted Answer

They are composed of a 40S and a 60S subunit, forming an 80S ribosome.

Question 14

Which process allows a eukaryotic cell to import specific molecules, such as cholesterol, by using cell-surface receptors and clathrin-coated vesicles?

Accepted Answer

Receptor-mediated endocytosis

Question 15

Which of the following is NOT a function of the eukaryotic cytoskeleton?

Accepted Answer

Synthesizing DNA

Question 16

A patient is diagnosed with tinea pedis (athlete’s foot). Which group of fungi is most likely responsible for this infection?

Accepted Answer

Dermatophytes

Question 17

Which of the following best describes the role of contractile vacuoles in certain protists?

Accepted Answer

They regulate osmotic pressure to prevent cell lysis in hypotonic environments.

Question 18

Which of the following is a characteristic of all eukaryotic plasma membranes?

Accepted Answer

Phospholipid bilayer structure with embedded sterols

Question 19

Which of the following statements about meiosis in eukaryotic cells is correct?

Accepted Answer

It involves two rounds of cell division and results in four haploid gametes.

Question 20

Which of the following protists is the only ciliated protozoan known to cause human disease?

Accepted Answer

Balantidium coli

Introduction to Eukaryotic Cells: Structure, Function, and Diversity

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