Mycology

Question 1

Features of fungi

Answer 1

Eukaryotic, obligate/facultative aerobe
Chemotrophic -get nutrients from chemicals in nature
Cell wall-chitin manan polysaccharide
Cytoplasmic membrane - sterols
Divide - asexually sexually both

Question 2

Classification of fungii
By morphological classification

Answer 2

1) yeast
2) yeast like fungi
3) moulds
4) dimorphic fungi

Question 3

1) Yeast features

Answer 3

Round to oval unicellular
Reproduction- budding
Form creamy mucoid colonies on culture ex: saccharomyces cervisiae
Cryptococcus neo-for-mans

Question 4

2) Yeast like fungi

Answer 4

Grows partly as yeast, partly chains
Elongated budding cells join end to end forming pseudohyphae
Ex: candidia albicans

Question 5

3) moulds

Answer 5

Grow as branching filaments - hyphae
They may be septate,aseptate
Hyphae grow branch to form tangled mass of growth - mycelium
Reproduction - sexual asexual spores
Ex:dermatophyte,aspergillus,penicillu

Question 6

4) Dimorphic fungi

Answer 6

At 37°C exist as yeast in host tissue
At 25° C remain as hyphal forms in soil
- most systemic infection caused
Ex: Histoplasma, blastomyces, coccidioides, paracoccidioides penicillium marneffei, sporothrix