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Micro Exam 2
Terms in this set (25)
What is Nitrogen Fixation?
Cyanobacteria reducing nitrogen gas (N2) to ammonia (NH3).
Nitrogen fixers provide nitrogen as a usable form to other organisms
How does temperature affect microbial growth?
High temperature break hydrogen bonds and make membranes too fluid
Minimum - Maximum - Optimum growth temperature
How does pH affect microbial growth?
Messes with hydrogen bonding within proteins and nucleic acids
ideal range = 6.5 - 7.5
normal 6.5 - 7.5
thrive in acidity
thrive in a basic environment
Hypertonic solution, what happens to cell?
Water rushes out, cell shrinks
Hypotonic solution, what happens to cell?
Water rushes in, cell grows (pop?)
Require a high salt concentration environmetn
Do not require high salt concentrations, but can tolerate them
Live under extreme pressure and rely on it to keep membrane shape
don't need oxygen
an organism that makes ATP by aerobic respiration if oxygen is present, but is capable of switching to fermentation or anaerobic respiration if oxygen is absent
they do not need oxygen and survive through fermentation, but have enzymes to detoxify poisonous forms of oxygen
require oxygen levels of 2% - 10% found in the stomach
required in very small amount
How much of a cell is composed of purely Carbon, Hydrogen, Oxygen, and Nitrogen
6 Different kinds of Culture Media
1. Defined Media (synthetic medium)
2. Complex Media
3. Selective Media
4. Differential Media
5. Anaerobic Media (reducing media)
6. Transport Media
Defined Media (synthetic medium)
The exact chemical composition is known
Different nutrients for autotrophs and so on
Contains nutrients that are released by partial digestion of yeast, beef, soy, or proteins.
Exact chemical composition is unknown because partial digestion releases a variety at different concentrations.
contains substances that either favor growth of particular organisms or inhibit growth of unwanted ones.
Eosin, methylene blue, crystal violet dyes, and bile salts help inhibit
Such as blood agar where the presence of visible changes in the medium or changes in the appearance of the colonies tells what kind of bacteria is growing
Anaerobic Media (reducing media)
contain compounds that chemically combine with free oxygen and remove it from the medium
used by hospitals to carry clinical specimens in a way to ensure people are not at risk for infection and specimens are not contaminated.
Speed is important when transferring these specimen with this medium.
Sets with similar terms
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