Q: Which of the following equations best represents the breakdown of cellulose by fungal cellulase enzymes?

$$\text{(C}_6\text{H}_{10}\text{O}_5\text{)}_n + n\,\text{H}_2\text{O} \rightarrow n\,\text{C}_6\text{H}_{12}\text{O}_6$$

Question 1

Which of the following best explains why fungi are classified as heterotrophs rather than autotrophs?

Accepted Answer

They absorb nutrients after secreting enzymes to digest organic matter externally.

Question 2

A fungal infection such as athlete’s foot is difficult to treat because the causative fungi:

Accepted Answer

Digest keratin in living tissues using external enzymes.

Question 3

Which of the following is the primary structural polymer found in fungal cell walls?

Accepted Answer

Chitin

Question 4

A fungus that forms a mutualistic relationship with plant roots, enhancing phosphorus uptake in exchange for sugars, is best described as:

Accepted Answer

A mutualist (mycorrhizal fungus)

Question 5

Which type of hyphae is characterized by the absence of septa and the presence of multiple nuclei within a continuous cytoplasm?

Accepted Answer

Coenocytic hyphae

Question 6

Why do fungi often switch from asexual to sexual reproduction under harsh environmental conditions?

Accepted Answer

Sexual reproduction increases genetic variation, enhancing adaptability.

Question 7

Which of the following best describes the process of absorptive nutrition in fungi?

Accepted Answer

Fungi secrete exoenzymes to digest food externally and absorb the resulting small molecules.

Question 8

A yeast cell divides by budding. Which of the following statements is correct about this process?

Accepted Answer

It is a form of asexual reproduction.

Question 9

Which stage of fungal sexual reproduction involves the fusion of two haploid nuclei to form a diploid zygote?

Accepted Answer

Karyogamy

Question 10

A scientist isolates a fungus with the following features: coenocytic hyphae, production of zygospores, and rapid growth on bread. To which phylum does this fungus most likely belong?

Accepted Answer

Zygomycota (historical grouping)

Question 11

Which of the following equations best represents the breakdown of cellulose by fungal cellulase enzymes?

Accepted Answer

$$	ext{(C}_6	ext{H}_{10}	ext{O}_5	ext{)}_n + n\,	ext{H}_2	ext{O} ightarrow n\,	ext{C}_6	ext{H}_{12}	ext{O}_6$$

Question 12

Which of the following is a function of the mannoprotein-rich outer layer of the fungal cell wall?

Accepted Answer

Facilitating cell–cell recognition and immune evasion

Question 13

A patient presents with a fungal infection of the toenails (onychomycosis). Why are these infections particularly difficult to treat?

Accepted Answer

Toenails contain abundant keratin, which is slowly penetrated by fungal enzymes.

Question 14

Which of the following best describes the role of mycelium in fungal biology?

Accepted Answer

It is a network of hyphae that absorbs nutrients from the environment.

Question 15

Which phylum of fungi is characterized by the production of sexual spores within sac-like asci?

Accepted Answer

Ascomycota

Question 16

Which of the following statements about fungal reproduction is correct?

Accepted Answer

Asexual reproduction produces genetically identical offspring via mitosis.

Question 17

A fungus is observed to form chains of elongated cells with constrictions at the junctions, but no true septa. This structure is best described as:

Accepted Answer

Pseudohyphae

Question 18

Which of the following best explains the ecological importance of saprotrophic fungi?

Accepted Answer

They recycle nutrients by decomposing dead organic matter.

Question 19

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

Accepted Answer

Plasmogamy → Karyogamy → Meiosis

Question 20

Which group of fungi is defined by the production of motile, flagellated spores and is considered among the most basal fungal lineages?

Accepted Answer

Chytridiomycota

lec 09:Fungi: Structure, Nutrition, and Reproduction

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