Question 1

Which of the following pieces of evidence most strongly supports the endosymbiotic theory for the origin of mitochondria and chloroplasts in eukaryotic cells?

Accepted Answer

Both organelles have circular DNA and replicate via binary fission, similar to prokaryotes.

Question 2

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

Accepted Answer

Phagocytosis

Question 3

Which of the following statements best distinguishes mitosis from meiosis in eukaryotic cells?

Accepted Answer

Mitosis maintains the chromosome number, while meiosis reduces it by half.

Question 4

A patient presents with a fungal infection of the skin, hair, and nails. Which group of fungi is most likely responsible?

Accepted Answer

Dermatophytes

Question 5

Which of the following best describes the function of phytosterols in plant cell membranes?

Accepted Answer

They maintain membrane stability and fluidity, similar to cholesterol in animal cells.

Question 6

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

Accepted Answer

Naegleria fowleri

Question 7

Which of the following is a correct sequence of events in the life cycle of an apicomplexan parasite such as Plasmodium (malaria parasite)?

Accepted Answer

Merogony → Gamogony → Sporogony

Question 8

Which of the following features is shared by mitochondria, chloroplasts, and modern prokaryotes, but NOT by the eukaryotic nucleus?

Accepted Answer

Replication by binary fission

Question 9

A fungal species produces spores in chains that are not enclosed in a sac. These spores are most likely:

Accepted Answer

Conidiospores

Question 10

Which of the following best explains why eukaryotic cell division (mitosis or meiosis) generally takes longer than prokaryotic binary fission?

Accepted Answer

Eukaryotic cells have a larger genome and must replicate membrane-bound organelles.

Question 11

A multicellular organism that absorbs nutrients from its environment, does not perform photosynthesis, and can exist as either unicellular or multicellular forms is most likely a:

Accepted Answer

Fungus

Question 12

Which of the following is a true statement about the plasma membrane of eukaryotic cells?

Accepted Answer

It is composed of a phospholipid bilayer containing sterols.

Question 13

A patient is diagnosed with a mycosis after taking broad-spectrum antibiotics. Which of the following best explains the increased risk of fungal infection in this scenario?

Accepted Answer

Disruption of normal microbiota allows opportunistic fungi like Candida to overgrow.

Question 14

Which of the following best describes the movement of eukaryotic flagella?

Accepted Answer

They move in a wavelike, back-and-forth motion.

Question 15

Which of the following is a distinguishing feature of receptor-mediated endocytosis compared to pinocytosis?

Accepted Answer

It utilizes specific cell surface receptors to selectively import molecules.

Question 16

A protozoan pathogen is observed to move by gliding and lacks flagella, cilia, or pseudopodia. It is most likely a member of which group?

Accepted Answer

Apicomplexa

Question 17

Which of the following equations correctly represents the chromosome number change during meiosis in a diploid organism?

Accepted Answer

$$2n \rightarrow n$$

Question 18

Which of the following is NOT a characteristic of eukaryotic cell walls?

Accepted Answer

They contain peptidoglycan.

Question 19

A fungal pathogen is observed to switch between a yeast-like form and a hyphal form depending on environmental conditions. This organism is best described as:

Accepted Answer

Dimorphic

Question 20

Which of the following best explains why crossing over during meiosis increases genetic diversity?

Accepted Answer

It results in the exchange of genetic material between homologous chromosomes, creating new allele combinations.

Introduction to Eukaryotic Cells and Their Diversity

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