Q: A yeast cell reproduces asexually by budding. If a population of yeast doubles every hour, how many cells will there be after 5 hours, starting from a single cell? Use the formula $$N = N_0$ \times 2^n$$, where $$N_0 is $$the initial number of cells and $$n is $$the number of generations.

$$N = 1 \times 2^5$ = 32$$ cells

Question 1

Which of the following statements best describes the main ecological role of saprophytic fungi?

Accepted Answer

They decompose dead organic matter, recycling nutrients in ecosystems.

Question 2

Which structure is primarily responsible for nutrient absorption in multicellular fungi?

Accepted Answer

Hyphae

Question 3

The fungal cell wall is mainly composed of which polysaccharide?

Accepted Answer

Chitin

Question 4

Which of the following best explains why fungi are classified as eukaryotes?

Accepted Answer

They possess a nucleus and complex membrane-bound structures.

Question 5

Which process in the fungal life cycle involves the fusion of cytoplasm from two parent mycelia?

Accepted Answer

Plasmogamy

Question 6

A yeast cell reproduces asexually by budding. If a population of yeast doubles every hour, how many cells will there be after 5 hours, starting from a single cell? Use the formula $$N = N_0$ 	imes 2^n$$, where $$N_0 is $$the initial number of cells and $$n is $$the number of generations.

Accepted Answer

$$N = 1 	imes 2^5$ = 32$$ cells

Question 7

Which of the following is NOT a characteristic of fungi?

Accepted Answer

Ability to fix atmospheric nitrogen

Question 8

Which type of fungal spore is produced by mitosis and is involved in asexual reproduction?

Accepted Answer

Conidiospore

Question 9

In the life cycle of Saccharomyces (yeast), which event leads to the formation of a diploid cell?

Accepted Answer

Fusion of two haploid cells (syngamy)

Question 10

Which of the following best describes the role of fungi in food spoilage and mycotoxin production?

Accepted Answer

Fungi can contaminate food, producing toxic secondary metabolites called mycotoxins.

Question 11

Which of the following kingdoms did eukaryotes NOT evolve into?

Accepted Answer

Bacteria

Question 12

Which feature distinguishes Oomycetes from true fungi?

Accepted Answer

Presence of cellulose in the cell wall

Question 13

A fungal infection in humans is most likely caused by which type of fungus?

Accepted Answer

Ascomycetes

Question 14

Which of the following best explains the significance of the universal phylogenetic tree based on 16/18S rRNA gene sequences?

Accepted Answer

It provides evidence for the common ancestry of all cellular life forms.

Question 15

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

Accepted Answer

Plasmogamy → Karyogamy → Meiosis

Question 16

Which of the following is a real-world example of a fungal disease that had a major impact on agriculture?

Accepted Answer

Phytophthora infestans causing the Irish potato famine

Question 17

Which of the following statements about hyphae is correct?

Accepted Answer

Hyphae form the mycelium and fruiting bodies in multicellular fungi.

Question 18

Which of the following best describes the role of protozoa in the carbon cycle?

Accepted Answer

Protozoa consume organic matter and release carbon dioxide through respiration.

Question 19

If a fungal colony has a mycelium with a surface area of $$100 \ \mathrm{cm}^2$$ and absorbs nutrients at a rate of $$0.5 \ \mathrm{mg} / \mathrm{cm}^2$$ per hour, how much nutrient is absorbed in 4 hours?

Accepted Answer

$$100 	imes 0.5 	imes 4 = 200 \ \mathrm{mg}$$

Question 20

Which of the following is a correct statement about the evolutionary timeline of cellular life?

Accepted Answer

Prokaryotes appeared approximately 3.5 billion years ago, while eukaryotes evolved about 1.5 billion years ago.

Eukaryotic Microorganisms: Fungi, Algae, and Protists

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