Mycology Intro

Question 1

Yeasts

Answer 1

single celled fungi

Question 2

Molds

Answer 2

multi celled fungi

Question 3

Mycosis

Answer 3

fungal infection

Question 4

Systemic mycosis

Answer 4

multi organ infection caused by fungi

Question 5

Opportunistic mycosis

Answer 5

fungal disease that occurs primarily in immunocompromised patients

Question 6

Dimorphic fungi

Answer 6

fungi that can demonstrate both a yeast phase and a mold phase

Question 7

Saprobe

Answer 7

organism capable of living on decaying organic matter (environmental)

Question 8

Hyphae

Answer 8

long branching fungal filaments

Question 9

Mycelium

Answer 9

several hyphae combine to form a meat of growth

Question 10

Vegetative mycelium

Answer 10

the portion of the mycelium that extends into culture medium and is responsible for absorbing water and nutrients

Question 11

Aerial mycelium

Answer 11

the portion of the mycelium that projects above culture medium and is responsible for reproduction

Question 12

Psuedohyphae

Answer 12

a chain of cells formed by budding yeast that resemble true hyphae

Question 13

Conidia

Answer 13

sporelike asexual reproductive structures (only involves division of nucleus and cytoplasm)

Question 14

Imperfect fungi

Answer 14

fungi that undergo asexual reproduction

Question 15

Blastoconidia

Answer 15

budding forms characteristically produced by yeast

Question 16

Chlamydoconidia

Answer 16

formed from cells in hyphae which become thickened and often enlarged

Question 17

Arthroconidia

Answer 17

also formed from cells in hyphae which become enlarged and thickened
on maturity these conidia are released by lysis of adjacent hyphae cells

Question 18

SAB agar

Answer 18

general purpose agar
nutritionally poor medium
mildly selective for fungi due to low pH

Question 19

Cycloheximide

Answer 19

inhibits saprophytic fungi

Question 20

Chloramphenicol

Answer 20

inhibits many gram (+) and (-) bacteria

Question 21

Gentamicin

Answer 21

inhibits primarily gram (-) bacteria

Question 22

IMA agar

Answer 22

used to grow most fungal pathogens

Question 23

Potato dextrose agar

Answer 23

used to enhance conidia development and pigment production

Question 24

Bird seen (niger seed) and caffein acid

Answer 24

agar used to grow crypto coccus neoformans/gatti which form brown to black colonies due to phenol oxidase activity

Question 25

Cornmeal agar with tween 80

Answer 25

used to differ candida species

Question 26

Candida albicans info

Answer 26

colonies with feet | pseudohyphae with chlamydospores on cornmeal agar

Question 27

Candida albicans ID

Answer 27

germ tube (+) maltose (+) galactose (+) trehalose (+)

Question 28

Candida glabrata info

Answer 28

no hyphae or pseudohyphae

Question 29

Candida glabrata ID

Answer 29

maltose (+) | trehalose (+)

Question 30

Candida tropicalis info

Answer 30

multi branched pseudohyphae with blastoconidia singly or in chains along the pseudohyphae

Question 31

Candida tropicalis ID

Answer 31

maltose (+) galactose (+) cellobiose (+) trehalose (+)

Question 32

Candida parapsilosis info

Answer 32

radiating pseudohyphae and scattered blastoconidia producing spider colonies

Question 33

Candida parapsilosis ID

Answer 33

maltose (+) galactose (+) trehalose (+)

Question 34

Candida krusi info

Answer 34

long, wavy, branched pseudohyphae with elongated to ovoid blastoconidia, budding off in branches

Question 35

Cryptococcus neoformans info

Answer 35

found in bat, pigeon and other bird droppings

Question 36

Cryptococcus gatti info

Answer 36

isolated from eucalyptus trees

Question 37

Cryptococcus species

Answer 37

``` india ink (+) for capsules direct Ag test brown to black on bird seed agar forms blastoconidia on cornmeal urease (+) ```

Question 38

Trichosporon

Answer 38

causes white piedra blastoconidia and arthroconidia present urease (+)

Question 39

White piedra

Answer 39

human hair infection characterized by nodules attached to the hair shaft on head, axilla, and genitals

Question 40

Malassezia info

Answer 40

causes dermatological disorders such as pityriasis versicolor growth medium supplemented with lipid (olive oil)

Question 41

Malassezia ID

Answer 41

spaghetti and meatballs appearance | hyphae and blastoconidia

Question 42

Rhodotorula info

Answer 42

found in moist environments | catheter line infection

Question 43

Rhodotorula ID

Answer 43

urease (+) | only forms blastoconidia

Question 44

Geotrichum candidum

Answer 44

actually a mold that may be misID as a yeast bc of similar morphology

Question 45

Geotrichum candidum ID

Answer 45

produce true hyphae with chains of arthroconidia