Question 1

Which of the following statements best describes the endosymbiotic theory as it relates to the origin of eukaryotic cells?

Accepted Answer

Eukaryotic cells originated when an archaeal cell engulfed a bacterium, which became mitochondria or chloroplasts.

Question 2

Which of the following features is unique to eukaryotic cells and not found in prokaryotic cells?

Accepted Answer

Membrane-bound organelles such as mitochondria and Golgi apparatus

Question 3

A scientist observes a cell with multiple linear chromosomes, 80S ribosomes in the cytoplasm, and a defined nucleus. Which domain does this cell most likely belong to?

Accepted Answer

Eukarya

Question 4

Which of the following is evidence supporting the endosymbiotic origin of mitochondria and chloroplasts?

Accepted Answer

They contain 70S ribosomes, circular DNA, and replicate by a binary fission-like process.

Question 5

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

Accepted Answer

It modifies, sorts, and distributes proteins and lipids received from the endoplasmic reticulum.

Question 6

A cell is observed to have a cell wall composed of chitin and glucans, and it reproduces by forming spores. To which kingdom does this organism most likely belong?

Accepted Answer

Fungi

Question 7

Which of the following processes is unique to eukaryotic cells and allows for the import of large extracellular materials?

Accepted Answer

Endocytosis

Question 8

Which of the following statements correctly compares mitosis and meiosis in eukaryotic cells?

Accepted Answer

Mitosis produces two diploid cells, while meiosis produces four haploid cells.

Question 9

Which of the following is a function of the eukaryotic cytoskeleton?

Accepted Answer

Maintaining cell shape, intracellular transport, and facilitating cell movement

Question 10

Which of the following best describes the role of the glycocalyx in eukaryotic cells?

Accepted Answer

It is a sticky, polysaccharide-rich layer involved in cell protection, adhesion, and communication.

Question 11

A pathogenic protozoan is classified based on its mode of motility. Which of the following is NOT a main grouping of protozoans by motility?

Accepted Answer

Myceliates

Question 12

Which of the following statements about fungal dimorphism is correct?

Accepted Answer

Dimorphic fungi can switch between yeast and mold forms depending on environmental conditions.

Question 13

Which of the following is a reason why developing medications against eukaryotic pathogens is challenging?

Accepted Answer

Eukaryotic pathogens have similar cellular structures to human cells, increasing the risk of toxicity.

Question 14

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

Accepted Answer

Digesting cellular debris and foreign materials using hydrolytic enzymes

Question 15

Which of the following structures is found in animal cells but NOT in plant cells?

Accepted Answer

Extracellular matrix (ECM)

Question 16

Which of the following best describes the difference between eukaryotic and prokaryotic flagella?

Accepted Answer

Eukaryotic flagella are composed of microtubules and move in a whip-like motion, while prokaryotic flagella are composed of flagellin and rotate like a propeller.

Question 17

Which of the following is a medically important segmented flatworm?

Accepted Answer

Cestode (tapeworm)

Question 18

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

Accepted Answer

Oxidative degradation of fats, amino acids, and detoxification of toxic compounds

Question 19

Which of the following best describes the role of the extracellular matrix (ECM) in animal cells?

Accepted Answer

It helps maintain cell shape, provides structural stability, transmits signals, and is a site for bacterial attachment.

Question 20

Which of the following is NOT a function of the eukaryotic plasma membrane?

Accepted Answer

Site of ATP synthesis

Introduction to Eukaryotes in Microbiology

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