Question 1

Which of the following is the strongest piece of evidence supporting the endosymbiotic theory for the origin of mitochondria in eukaryotic cells?

Accepted Answer

Mitochondria have their own circular DNA similar to bacterial genomes $$\left(	ext{circular DNA} ight).$$

Question 2

Which of the following best distinguishes eukaryotic cells from prokaryotic cells?

Accepted Answer

Presence of membrane-bound organelles such as the nucleus and mitochondria.

Question 3

A scientist discovers a unicellular organism with a cell wall, no nucleus, and circular DNA. Which kingdom does this organism most likely belong to?

Accepted Answer

Bacteria

Question 4

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

Accepted Answer

Protein synthesis

Question 5

Which structure is responsible for packaging and modifying proteins in eukaryotic cells?

Accepted Answer

Golgi apparatus

Question 6

A patient is diagnosed with malaria. Which pathogenic protozoan is responsible for this disease?

Accepted Answer

Plasmodium species

Question 7

Which of the following evolutionary developments most directly enabled the emergence of eukaryotic cells?

Accepted Answer

Acquisition of endosymbiotic bacteria that became mitochondria and chloroplasts

Question 8

Which of the following best describes the main difference between animal and plant cell extracellular structures?

Accepted Answer

Plant cells have a cellulose-based cell wall, while animal cells have an extracellular matrix rich in collagen.

Question 9

Which of the following correctly matches a eukaryotic cell structure with its function?

Accepted Answer

Lysosome: digestion of macromolecules and cellular debris

Question 10

Which of the following structures is found in eukaryotic cells but not in prokaryotic cells?

Accepted Answer

Nucleus

Question 11

A eukaryotic flagellum is primarily composed of which protein, and what is its arrangement?

Accepted Answer

Tubulin; $$9+2$$ microtubule arrangement

Question 12

Which of the following is a key difference between the genetic material of prokaryotes and eukaryotes?

Accepted Answer

Eukaryotes have linear chromosomes contained within a nucleus, while prokaryotes have circular DNA in the cytoplasm.

Question 13

Which of the following best explains why mitochondria and chloroplasts are considered semi-autonomous organelles?

Accepted Answer

They contain their own DNA and ribosomes, and can replicate independently of the cell cycle.

Question 14

Which of the following is NOT a characteristic of all eukaryotic cells?

Accepted Answer

Presence of a peptidoglycan cell wall

Question 15

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

Accepted Answer

Site of ribosomal RNA synthesis and ribosome assembly

Question 16

Which of the following is a correct pairing of a eukaryotic organelle and its primary function?

Accepted Answer

Mitochondrion: aerobic respiration and ATP synthesis $$\left(	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6	ext{O}_2 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O} + 	ext{ATP}ight)$$

Question 17

Which of the following is a unique feature of the kingdom Fungi compared to other eukaryotic kingdoms?

Accepted Answer

Cell walls composed of chitin

Question 18

Which of the following best explains why eukaryotic cells can be much larger than prokaryotic cells?

Accepted Answer

Compartmentalization by organelles increases efficiency and allows for larger cell size.

Question 19

Which of the following is a function of the eukaryotic vacuole, especially in plant cells?

Accepted Answer

Storage of water, ions, and waste products; maintenance of turgor pressure

Question 20

Which of the following is a correct description of the evolutionary relationship between Archaea and Eukarya?

Accepted Answer

Eukarya share a more recent common ancestor with Archaea than with Bacteria.

Fundamental Concepts in Eukaryotic Cell Biology and Microbiology

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