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Difficulty: HardKingdom Fungi: Moulds, Yeasts, and Mushrooms

A culture sample containing species from Kingdom Fungi—specifically a bread mould (*Rhizopus*), a yeast (*Saccharomyces*), and a gill mushroom (*Agaricus*)—was subjected to biochemical and structural analysis. Which of the following attributes correctly characterizes all three of these fungal representatives?

  1. Cell walls composed of chitin and carbohydrate reserve stored in the form of glycogenAnswer
  2. B
    Ingestion of particulate food matter followed by intracellular digestive vacuole formation
  3. C
    Cell walls containing peptidoglycan and energy reserves stored as starch grains
  4. D
    Presence of multinucleate coenocytic hyphae forming an extensive vegetative mycelium

Answer

Fungi across all major groups (moulds, yeasts, and mushrooms) share chitinous cell walls and store reserve food as glycogen rather than starch.
The correct statement highlights two universal diagnostic features of Kingdom Fungi: cell walls built from chitin polymers and carbohydrate storage in the form of glycogen.

Step-by-Step Solution

1
Analyze cell wall composition across fungal archetypes
Moulds (*Rhizopus*), yeasts (*Saccharomyces*), and mushrooms (*Agaricus*) all feature cell walls composed primarily of chitin rather than cellulose or peptidoglycan.
Chitin is the defining structural polysaccharide of Kingdom Fungi.
2
Examine food storage compounds in Kingdom Fungi
Excess glucose in fungal cells is polymerised into glycogen, identical to animal storage products.
Fungi lack plastids and cannot synthesize or store plant starch.
3
Evaluate morphological variations to eliminate false generalizations
Unicellular yeast lacks hyphae, while *Agaricus* has septate hyphae and *Rhizopus* has coenocytic hyphae, making hyphal structure non-universal across all three.
Structural organization varies significantly between unicellular and multicellular fungal forms.

Key Concept

Biochemical and structural characteristics of Kingdom Fungi (Chitin cell wall, Glycogen storage, Saprophytic nutrition)
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Topics

Kingdom Fungi: Moulds, Yeasts, and Mushrooms

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