Question 1

Which of the following statements best describes the main structural difference between eukaryotic and bacterial flagella?

Accepted Answer

Eukaryotic flagella are composed of a 9 + 2 arrangement of microtubules, while bacterial flagella are composed of flagellin protein.

Question 2

Which of the following is a unique feature of the eukaryotic cell membrane compared to the bacterial cell membrane?

Accepted Answer

Presence of sterols that provide membrane rigidity.

Question 3

Which organelle is responsible for the synthesis of ribosomal RNA and the assembly of ribosomal subunits in eukaryotic cells?

Accepted Answer

Nucleolus

Question 4

A protein is synthesized in the rough endoplasmic reticulum (RER). Describe the correct sequence of organelles it will pass through before being secreted from the cell.

Accepted Answer

RER → Transitional vesicle → Golgi apparatus → Condensing vesicle → Cell membrane

Question 5

Which of the following best explains why mitochondria are considered evidence for the endosymbiotic theory?

Accepted Answer

They contain circular DNA and 70S ribosomes similar to bacteria.

Question 6

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

Accepted Answer

Synthesis of ATP

Question 7

A fungal cell is observed to have a thick cell wall composed of chitin and mixed glycans. Which of the following statements is correct regarding this structure?

Accepted Answer

It provides structural support and protection, and is chemically distinct from bacterial cell walls.

Question 8

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

Accepted Answer

They contain enzymes for intracellular digestion and removal of cell debris.

Question 9

Which of the following is a correct statement about fungal nutrition?

Accepted Answer

All fungi are heterotrophs and can digest a wide array of organic substrates.

Question 10

Which of the following is a benefit provided by fungi to humans or the environment?

Accepted Answer

Decomposition of organic matter and production of antibiotics.

Question 11

Which of the following best describes the difference between vegetative hyphae and reproductive hyphae in molds?

Accepted Answer

Vegetative hyphae are responsible for growth and nutrient absorption, while reproductive hyphae produce spores.

Question 12

Which of the following is a correct pairing of protozoan locomotion and the group it characterizes?

Accepted Answer

Cilia – Ciliophora

Question 13

Why is the cyst stage important in the life cycle of many protozoa?

Accepted Answer

It allows survival in harsh environmental conditions and aids in disease transmission.

Question 14

Which of the following is a distinguishing feature of the trophozoite stage in protozoa?

Accepted Answer

It is the motile, feeding, and active stage.

Question 15

Which of the following statements about helminth life cycles is correct?

Accepted Answer

The definitive host is where adulthood and mating occur.

Question 16

Which of the following is a correct example of a flatworm and a roundworm, respectively?

Accepted Answer

Tapeworm and nematode

Question 17

A child presents with intense itching around the anus, especially at night. Microscopic examination reveals small, curved worms. Which helminth is most likely responsible, and what is the main route of transmission?

Accepted Answer

Enterobius vermicularis (pinworm); fecal-oral transmission via contaminated hands or objects.

Question 18

Which of the following best describes the process of endosymbiosis in the evolution of eukaryotic cells?

Accepted Answer

Ancestral archaea engulfed bacteria, which became mitochondria and chloroplasts.

Question 19

Which of the following is a correct statement about the function of the Golgi apparatus?

Accepted Answer

It modifies, sorts, and packages proteins for secretion or delivery to other organelles.

Eukaryotic Cells and Microorganisms: Structure, Function, and Diversity

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