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

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

Accepted Answer

Multiple rounds of mitosis without cytokinesis, forming a multinucleate cell, followed by simultaneous cytokinesis to produce many daughter cells.

Question 3

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

Accepted Answer

Fungi have cell walls composed of chitin, while water molds have cell walls composed of cellulose.

Question 4

Which group of protozoa is characterized by the presence of a parabasal body and the absence of mitochondria?

Accepted Answer

Parabasala

Question 5

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 6

Which of the following best describes the alternation of generations in multicellular algae?

Accepted Answer

A haploid individual produces gametes that fuse to form a diploid zygote, which grows into a diploid individual; the diploid individual produces haploid spores by meiosis.

Question 7

Which of the following is a medically significant consequence of dinoflagellate blooms (red tides)?

Accepted Answer

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

Question 8

Which of the following statements about fungal reproduction is correct?

Accepted Answer

Yeasts reproduce by budding, while molds reproduce by forming spores.

Question 9

Which of the following is a unique feature of the Division Ascomycota among fungi?

Accepted Answer

Formation of ascospores within sacs called asci.

Question 10

Which of the following best explains why water molds are classified with brown algae rather than with true fungi?

Accepted Answer

Water molds have tubular mitochondrial cristae and cellulose cell walls, features shared with brown algae.

Question 11

Which of the following is a correct pairing of a protozoan group and a human disease it causes?

Accepted Answer

Kinetoplastids – African sleeping sickness

Question 12

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

Accepted Answer

Pump excess water out of the cell to maintain osmotic balance.

Question 13

Which of the following best describes the nutritional mode of most fungi?

Accepted Answer

Chemoheterotrophic saprobes that absorb nutrients from dead organic matter.

Question 14

Which of the following is a correct statement about lichens?

Accepted Answer

They are a partnership between a fungus and a photosynthetic microbe.

Question 15

Which of the following is a distinguishing feature of the Kingdom Rhodophyta (red algae)?

Accepted Answer

Presence of the red pigment phycoerythrin and cell walls composed of agar or carrageenan.

Question 16

Which of the following is true regarding the role of arthropod vectors in disease transmission?

Accepted Answer

Arthropod vectors can transmit pathogens mechanically or biologically, and include both insects and arachnids.

Question 17

Which of the following best explains why there are few pathogenic algae?

Accepted Answer

Most algae are photoautotrophs and do not require a host for survival, making parasitism rare.

Question 18

Which of the following is a correct statement about the classification of eukaryotic microorganisms?

Accepted Answer

Modern classification is based more on similarities in nucleotide sequences.

Question 19

Which of the following is a correct description of the dikaryon stage in fungal sexual reproduction?

Accepted Answer

A stage with two haploid nuclei per cell that have not yet fused.

Question 20

Which of the following is a correct statement about the morphology of fungi?

Accepted Answer

Molds are composed of long filaments called hyphae, while yeasts are small, globular, and unicellular.

Characterizing and Classifying Eukaryotes: Protozoa, Fungi, Algae, Water Molds, and Parasitic Helminths

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