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 scientist observes a unicellular, eukaryotic organism that lacks a cell wall, has two nuclei, and moves using cilia. Which group does this organism most likely belong to?

Accepted Answer

Alveolates—Ciliates

Question 3

Which of the following is a distinguishing feature of fungi that separates them from plants and algae?

Accepted Answer

They are chemoheterotrophic and have cell walls typically composed of chitin.

Question 4

Which process results in four haploid nuclei from a single diploid nucleus and involves two sequential divisions?

Accepted Answer

Meiosis

Question 5

A patient is diagnosed with a disease caused by Trypanosoma. Which group of protozoa does this pathogen belong to, and what is a unique feature of this group?

Accepted Answer

Euglenozoa—Flagella with a crystalline rod

Question 6

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

Accepted Answer

Alternation between haploid and diploid multicellular forms, with sexual reproduction producing gametes and asexual reproduction by fragmentation

Question 7

Which of the following is a correct pairing of a fungal division and its distinguishing sexual spore?

Accepted Answer

Basidiomycota—Basidiospores

Question 8

A researcher finds a microorganism with a single nucleus, no mitochondria, and a parabasal body. Which genus is most likely being observed?

Accepted Answer

Trichomonas

Question 9

Which of the following is a reason why water molds are classified with brown algae rather than true fungi?

Accepted Answer

They have tubular cristae in their mitochondria and cell walls of cellulose.

Question 10

Which of the following best explains why large eukaryotes such as mosquitoes and ticks are studied in microbiology?

Accepted Answer

They are important vectors that transmit microscopic pathogens.

Question 11

Which of the following is a unique feature of dinoflagellates that can have significant ecological and medical impacts?

Accepted Answer

They produce neurotoxins that can cause red tides.

Question 12

Which of the following statements about fungal nutrition is correct?

Accepted Answer

Most fungi are saprobes that absorb nutrients from dead organisms.

Question 13

A scientist is studying a lichen. Which of the following best describes the relationship within a lichen?

Accepted Answer

A partnership between a fungus and a photosynthetic microbe, where the fungus provides nutrients, water, and protection, and the microbe provides carbohydrates and oxygen.

Question 14

Which of the following is a correct description of schizogony, as seen in some protozoa?

Accepted Answer

A process where a single cell undergoes multiple rounds of mitosis before cytokinesis, resulting in many daughter cells.

Question 15

Which of the following is a distinguishing feature of the division Ascomycota?

Accepted Answer

Formation of ascospores in sacs called asci

Question 16

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

Accepted Answer

Most algae are photoautotrophic and do not require a host for nutrients.

Question 17

Which of the following is a correct pairing of an arthropod vector and the class to which it belongs?

Accepted Answer

Tick—Arachnida

Question 18

Which of the following is a feature of brown algae (Phaeophyta) that is used industrially?

Accepted Answer

Production of alginic acid, used as a thickening agent

Question 19

Which of the following statements about the classification of eukaryotic microorganisms is correct?

Accepted Answer

Modern classification is based more on similarities in nucleotide sequences.

Characterizing and Classifying Eukaryotes in Microbiology

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