Question 1

Which of the following statements best explains why mitosis is not synonymous with cell division in eukaryotes?

Accepted Answer

Mitosis is the division of the nucleus, while cell division (cytokinesis) refers to the division of the cytoplasm, which may not always occur simultaneously.

Question 2

A patient presents with severe watery diarrhea after drinking from a mountain stream. Microscopic examination reveals a flagellated protozoan with two nuclei and no mitochondria. Which organism is most likely responsible?

Accepted Answer

Giardia intestinalis

Question 3

Which of the following best describes the process of schizogony as seen in Plasmodium species?

Accepted Answer

A single cell undergoes multiple rounds of mitosis without cytokinesis, forming a multinucleate schizont, which then divides into many daughter cells simultaneously.

Question 4

Which of the following is a distinguishing feature of fungi compared to water molds?

Accepted Answer

Fungi have cell walls composed of chitin.

Question 5

Which of the following protozoan groups is characterized by the presence of membrane-bound alveoli beneath the plasma membrane?

Accepted Answer

Alveolates

Question 6

A scientist is studying a unicellular, photoautotrophic organism with chloroplasts and a crystalline rod in its flagella. Which group does this organism most likely belong to?

Accepted Answer

Euglenozoa

Question 7

Which of the following equations correctly represents the ploidy change during meiosis in eukaryotes?

Accepted Answer

$$2n \rightarrow n$$

Question 8

Which of the following is a medically significant consequence of dinoflagellate blooms in marine environments?

Accepted Answer

Production of neurotoxins that can accumulate in shellfish and cause poisoning in humans.

Question 9

Which of the following best describes the mutualistic relationship in lichens?

Accepted Answer

A fungus provides nutrients, water, and protection, while a photosynthetic microbe provides carbohydrates and oxygen.

Question 10

Which of the following is true regarding the classification of eukaryotic microorganisms in modern taxonomy?

Accepted Answer

Classification is primarily based on similarities in nucleotide sequences.

Question 11

A researcher isolates a fungus that produces ascospores in sacs and is commonly found spoiling food. To which division does this fungus most likely belong?

Accepted Answer

Ascomycota

Question 12

Which of the following is a characteristic of brown algae (Phaeophyta) that distinguishes them from green algae (Chlorophyta)?

Accepted Answer

They use laminarin and oils as food reserves.

Question 13

Which of the following best explains why water molds are more closely related to brown algae than to true fungi?

Accepted Answer

They have tubular cristae in mitochondria, cellulose cell walls, and diploid bodies, similar to brown algae.

Question 14

Which of the following is a unique feature of diplomonads such as Giardia intestinalis?

Accepted Answer

Two equal-sized nuclei and lack of mitochondria

Question 15

Which of the following is the correct sequence of events in the sexual reproduction of fungi?

Accepted Answer

Plasmogamy, karyogamy, meiosis, spore formation

Question 16

Which of the following best describes the role of arthropod vectors in the transmission of microbial diseases?

Accepted Answer

They carry and transmit pathogens between hosts, either mechanically or biologically.

Question 17

Which of the following is a reason why there are few pathogenic algae?

Accepted Answer

Algae are primarily photoautotrophic and do not require a host for nutrients.

Question 18

Which of the following is a correct statement about the alternation of generations in multicellular algae?

Accepted Answer

It involves alternating between haploid and diploid multicellular stages.

Question 19

Which of the following is a function of contractile vacuoles in protozoa?

Accepted Answer

They pump excess water out of the cell to maintain osmotic balance.

Question 20

Which of the following best explains why a fungal dikaryon (n + n) is not considered diploid (2n)?

Accepted Answer

The two haploid nuclei remain separate and do not fuse to form a single diploid nucleus.

Characterizing and Classifying Eukaryotes: Microbiology Study Notes

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