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Questions and Answers
A fungus exhibiting dimorphism can grow in which of the following forms depending on environmental temperature?
A fungus exhibiting dimorphism can grow in which of the following forms depending on environmental temperature?
- Only as yeasts at room temperature.
- Exclusively as molds at all temperatures.
- Exclusively as mushrooms regardless of temperature.
- As yeasts in tissues at 37°C and as molds in the natural environment at 25°C. (correct)
Which characteristic distinguishes coenocytic hyphae from septate hyphae?
Which characteristic distinguishes coenocytic hyphae from septate hyphae?
- Coenocytic hyphae are found only in yeasts, while septate hyphae are found only in molds.
- Coenocytic hyphae are unicellular, while septate hyphae are multicellular.
- Coenocytic hyphae lack cross walls, whereas septate hyphae possess them. (correct)
- Coenocytic hyphae reproduce sexually, while septate hyphae reproduce asexually.
Which of the following structures is a defining characteristic of lichens?
Which of the following structures is a defining characteristic of lichens?
- A symbiotic association between hyphae and either cyanobacteria or green algae. (correct)
- Hyphae that lack cross walls.
- The ability to reproduce exclusively through budding.
- The presence of sporangiospores within a protective sac.
Asexual reproduction in fungi via spores enclosed in a sac-like structure results in the formation of which type of spore?
Asexual reproduction in fungi via spores enclosed in a sac-like structure results in the formation of which type of spore?
What distinguishes conidia from sporangiospores?
What distinguishes conidia from sporangiospores?
Which type of conidium is formed by the separation of hyphal cells, resulting in rectangular, box-like spores?
Which type of conidium is formed by the separation of hyphal cells, resulting in rectangular, box-like spores?
A spherical conidium formed due to the thickening of a hyphal cell is known as what?
A spherical conidium formed due to the thickening of a hyphal cell is known as what?
In fungal reproduction, which type of spore arises from a budding process directly from a parent cell?
In fungal reproduction, which type of spore arises from a budding process directly from a parent cell?
Spores that are produced by extruding through small pores in the parent cell are called:
Spores that are produced by extruding through small pores in the parent cell are called:
A fungus that produces both microconidia and macroconidia does so under different circumstances; what is the key difference between them?
A fungus that produces both microconidia and macroconidia does so under different circumstances; what is the key difference between them?
Flashcards
Fungal Morphological Types
Fungal Morphological Types
Fungi are divided into Mushrooms, Yeasts, and Molds based on their physical form.
Dimorphic Fungi
Dimorphic Fungi
Some fungi can switch between yeast and mold forms depending on temperature; yeast form at 37°C (in tissues) and mold form at 25°C (in environment/lab).
Septate Hyphae
Septate Hyphae
Hyphae are the thread-like structures of fungi; if they have cross-walls, they're called septate hyphae.
Coenocytic Hyphae
Coenocytic Hyphae
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Fungal Reproduction
Fungal Reproduction
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Sporangiospores
Sporangiospores
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Conidia (Conidiospores)
Conidia (Conidiospores)
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Arthrospore
Arthrospore
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Chlamydospore
Chlamydospore
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Blastospore
Blastospore
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Study Notes
- Fungi are morphologically divided into mushrooms, yeasts, and molds.
- Some fungi can grow as either yeasts or molds depending on the temperature; these are known as dimorphic fungi.
- As yeasts, they grow in tissues at 37° C.
- As molds, they grow in their natural environment and in the lab at 25° C.
- Fungi can grow in the presence or absence of oxygen.
- Fungi can be multicellular (hyphae) or unicellular organisms.
- Hyphae with cross walls (septa) are called septate hyphae.
- Hyphae with no septa are called coenocytic hyphae.
- Fungi reproduce asexually (budding) or sexually (genetic recombination).
- Lichens consist of hyphae and cyanobacteria or green algae.
Asexual Spores
- Sporangiospores: Spores are formed inside a sac (sporangium).
- Conidia (conidiospores): Spores are not enclosed by a sac.
Types of Conidia
- Arthrospore: rectangular spore
- Chlamydospore: spherical spore
- Blastospore: buds from a parent cell
- Phialospore: buds from the mouth of a vase-shaped cell
- Microconidium and macroconidium: spores formed by the same fungus under different conditions.
- Microconidium are one-celled.
- Macroconidium are two or more celled.
- Porospore: grows out through small pores
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