MicroBiology Lab Exam 1 Blinn
Questions with 100% Correct Answers
Media - ✔✔1. Solid
2. Liquid (Broth)
Agar - ✔✔nutritionally inert substance added to media to give it a solid
consistency.
Inoculum - ✔✔specimen or material used (E.Coli)
Microorganisms' Environmental Roles: - ✔✔1. Primary Producers
2. Decomposers
3. Microbiota
Microbiota - ✔✔- living on skin surface & mucous membranes
- usually beneficial (line intestinal tract, aid in digestion, and synthesis of
vitamin K & B12)
- can stop pathogenic bacteria from colonizing and can stimulate immune
function.
Ubiquity of Microorganisms - ✔✔refers to the concept that microorganisms are
everywhere.
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©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025.
, Aseptic Technique - ✔✔ensure the culturing of the organisms you want to work
with is NOT contaminated by the air or skin.
Synthetic Media (Defined) - ✔✔- used for growth of microorganisms.
- exact composition & nutrient quantity is known.
- used for more fastidous organisms.
Complex Media (Undefined) - ✔✔- for routine growth of microorganisms.
- same elements as defined media, but varying amounts.
3 Components of Complex Media: - ✔✔1. Beef Extract
2. Yeast Extract
3. Peptones
Solid Media - ✔✔Agar heated to 95 Celcius, cooled to 40 Celcius, and then
nutrients are added.
Broth Media - ✔✔powdered form, added to water to achieve proper
concentration through dilution.
Autoclave - ✔✔- uses steam to kill by denaturing proteins.
- used for sterilizing media & instruments.
Dry Heat Sterilization - ✔✔- kills organisms by conduction of the heat that
oxidizes molecules.
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©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025.
Questions with 100% Correct Answers
Media - ✔✔1. Solid
2. Liquid (Broth)
Agar - ✔✔nutritionally inert substance added to media to give it a solid
consistency.
Inoculum - ✔✔specimen or material used (E.Coli)
Microorganisms' Environmental Roles: - ✔✔1. Primary Producers
2. Decomposers
3. Microbiota
Microbiota - ✔✔- living on skin surface & mucous membranes
- usually beneficial (line intestinal tract, aid in digestion, and synthesis of
vitamin K & B12)
- can stop pathogenic bacteria from colonizing and can stimulate immune
function.
Ubiquity of Microorganisms - ✔✔refers to the concept that microorganisms are
everywhere.
1|Page
©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025.
, Aseptic Technique - ✔✔ensure the culturing of the organisms you want to work
with is NOT contaminated by the air or skin.
Synthetic Media (Defined) - ✔✔- used for growth of microorganisms.
- exact composition & nutrient quantity is known.
- used for more fastidous organisms.
Complex Media (Undefined) - ✔✔- for routine growth of microorganisms.
- same elements as defined media, but varying amounts.
3 Components of Complex Media: - ✔✔1. Beef Extract
2. Yeast Extract
3. Peptones
Solid Media - ✔✔Agar heated to 95 Celcius, cooled to 40 Celcius, and then
nutrients are added.
Broth Media - ✔✔powdered form, added to water to achieve proper
concentration through dilution.
Autoclave - ✔✔- uses steam to kill by denaturing proteins.
- used for sterilizing media & instruments.
Dry Heat Sterilization - ✔✔- kills organisms by conduction of the heat that
oxidizes molecules.
2|Page
©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025.
