Question 1

Which structural feature distinguishes septate hyphae from coenocytic hyphae in fungi?

Accepted Answer

Septate hyphae have cross-walls called septa separating individual cells.

Question 2

According to Table 12.1, which of the following is TRUE regarding the cell wall composition of fungi compared to bacteria?

Accepted Answer

Fungi have cell walls made of chitin, while bacteria have cell walls made of peptidoglycan.

Question 3

A fungal colony on agar shows two distinct regions: aerial hyphae and vegetative hyphae. What is the primary function of the aerial hyphae?

Accepted Answer

Aerial hyphae are involved in reproduction, often producing spores.

Question 4

Which of the following best describes dimorphism in pathogenic fungi?

Accepted Answer

Dimorphic fungi can switch between yeast-like and mold-like forms depending on temperature.

Question 5

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

Accepted Answer

Plasmogamy → Karyogamy → Meiosis

Question 6

Which type of fungal spore is NOT enclosed in a sac?

Accepted Answer

Conidiospore

Question 7

A patient presents with a cutaneous mycosis characterized by ring-shaped lesions on the skin. Which enzyme is most likely secreted by the causative dermatophyte?

Accepted Answer

Keratinase

Question 8

Which of the following fungi is classified as a Zygomycota and is known as black bread mold?

Accepted Answer

Rhizopus

Question 9

Which medically important fungus produces both sexual (ascospores) and asexual (conidiospores) spores and is associated with systemic mycoses?

Accepted Answer

Ascomycota

Question 10

Which of the following statements about yeast reproduction is correct?

Accepted Answer

Yeasts reproduce by budding, where a new cell forms as an outgrowth of the parent cell.

Question 11

Which of the following is a major economic use of Saccharomyces cerevisiae?

Accepted Answer

Production of bread, wine, and hepatitis B vaccine

Question 12

A fungal infection that begins in the lungs and spreads throughout the body is classified as:

Accepted Answer

Systemic mycosis

Question 13

Which of the following is TRUE about Microsporidia?

Accepted Answer

They lack mitochondria and hyphae, and are intracellular parasites.

Question 14

Which of the following is a correct formula for the process of meiosis in fungal sexual reproduction?

Accepted Answer

$$2n \rightarrow n$$

Question 15

Which of the following is a plausible reason why immunocompromised patients are more susceptible to opportunistic mycoses?

Accepted Answer

Their weakened immune system cannot control normal microbiota or environmental fungi.

Question 16

Which of the following best describes the difference in metabolism between fungi and bacteria as shown in Table 12.1?

Accepted Answer

Fungi are limited to heterotrophic, aerobic, or facultatively anaerobic metabolism.

Question 17

Which of the following fungal structures is responsible for the production of conidia in Aspergillus?

Accepted Answer

Conidiophore

Question 18

Which of the following is a plausible explanation for why Penicillium is classified as an anamorph?

Accepted Answer

It produces only asexual spores and lacks a known sexual stage.

Question 19

Which of the following is a correct description of the life cycle of Rhizopus, a zygomycete?

Accepted Answer

It alternates between asexual reproduction via sporangiospores and sexual reproduction via zygospores.

The Eukaryotes: Fungi, Protozoans, and Multicellular Parasites

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