Microbiology Lab 3 notes

What is a colony

A visible mass of microbial cells originating from one cell

What type of microbial colony is large and fuzzy and grows upward and touches the lid

mold

What microbial colony is small creamy moist and circular

Bacteria

What microbial colony is medium sized, dry, crusy, and a white beige color

yeast

what does PDA (Potato Dextrose Agar) do

supports mold growth

How does PDA support mold growth

High in carbohydrates and has a pH of 5.2

What does NA (Nutrient Agar) do

Support bacterial growth

How does NA (Nutrient Agar) support bacterial growth

pH is 7 (neutral), high in proteins

What are Vegetative Structures in molds

The part of the mold that obtains/absorbs nutrients (Made of cell wall)

Can you identify mold based on Vegetative Structures

no you can not

How do mold absorb nutrients

through the cell wall

What is the Thallus of the mold

The entire body of mold

What are Hyphae/Hypha

multicellular filament structures that make up the body and structure of mold

What are Coenocytic Hyphae

Hyphae with no septums/septa and are continuous

What are Mycelium

Filamentous mass that is visible to the eye ( ex roots on a mushroom)

Can molds be identified by the type of spore

Yes they can be ID’d by spore type

What are the 2 types of spores

Asexual spore and Sexual spores

What are traits of Sexual spores

Genetically exchange information(meiosis) and not conmen in nature

What type of spore is more conmen in nature

Asexual spores

What are 2 types of Asexual spores

Conidiospores and Sporangiospores

What are Microconidia

Small asexual spores

What are types of Microconidia

Penicillium sp. and Aspergillus sp.

What is a Conidiophore

A stalk that moves upwards and releases conidia

What is this

ConidioPHORE

What is this

ConidioSPORE

What are Macroconidia

large asexual spores that rest ontop of the conidiosphore

What are examples of Macroconidia

Fusarium, Alternaria

What is a Sporangium

The sac where reproductive spores are stored (Sporangiospores)

What is the Sporangiophore

the supporting structure/stalk that has a sporangium on it

What are some Sporangiospore examples

Rhizopus sp. and Mucor sp.

Where are Sporangiospores stored

Inside the Sporangium

How to get a microbe culture alone and isolated

Streaking (streaking for isolation)

What is one streaking method

The T-Streak method

What is the T-Streak method used for

To separate individual colonies

Why do wee invert the petri dish

To avoid condensation

What is this stalk like thing

Sporangiophore

What is this sac lookin thing

Sporangium

What microbe is under the microscope here

Penicilium

What microbe is this

Aspergillus

What microbe is this

Alternaria

What microbe is this

Curvulvaria

What microbe is this

Stemphyllium

What microbe is this

Fusarium

What microbe is this

Microsporums

What Microbe is this

Stachybotrys