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Chapter #20 Bacteria and Viruses
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34
Biology
9th Grade
01/13/2015

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Term
Prokaryote
Definition
a single celled oganism that lack a nucleus and major organells
Term
Kingdom Eubacteria
Definition
larger group that is found almost everywhere... cell walls contain the carbohdrate peptidoglycan
Term
Kingdom Archaebacteria
Definition

Bacteria that live in harsh envionments and are chemically different than eu bacteria

 

They lack peptoglycan and have different membrane lipids

 

There DNA sequences are similare the Eukaryotic organisms.

Term
Methangens
Definition
prokaryotes that produce methane gas and live in oxygen-free environments
Term
Aerobe
Definition
bacteria that require oxygen for survival
Term
Anaerobe
Definition
bacteria that live in oxygen-free evironments (oxygen is poision)
Term
Thermophiles
Definition
live in hot environment
Term
Halophiles
Definition
live in salty envionments
Term
Prokaryotes are idenified by:
Definition

1. Shape

2. Chemical nuture of cell walls

3. The way they move

4. The way they obtain enery

Term
Three bacterial shapes:
Definition
Bacilli, Cocci, Spirilla
Term
Bacilli
Definition
rod-shaped prokaryotes
Term
Cocci
Definition
spherical or circular prokaryotes
Term
Spirilla
Definition
spiral or corkscrew shaped bacteria
Term
Strepto
Definition
chains of bacteria
Term
staphylo
Definition
grape-like clusters of bacteria
Term
Diplo
Definition
2 bacteria together
Term
Mono
Definition
1 bacterium
Term
Gram staining
Definition

1. 2 dyes are applied to bacteria

a. violet stain- primary stain

b. Red stain- counter stain

2. Violet stain is applied first stains peptidoglycan cell wall

3. Alcohol is applied and if bacteria stays violet it is gram-postive

4. If bacteria are Gram-Negative they will have thin walls and an outer lipid layer.  Alchohol dissolves lipids and counter stian dyes them red/pink

Term
Flagella
Definition
whip-like stucture used for movement
Term
heterotrophs
Definition
get energy by consuming organic molecules made by other organisms
Term
Autotrophs
Definition
get energy by making their own food from inorganic molecules
Term

Type of heterotroph:

Chemoheterotrophs

Definition
organisms that must take in organic molecules for both energy and carbon.
Term

Type of heterotroph:

Photoheterotrophs

Definition
organismsthat are photosynthetic but need organic compounds as a carbon source
Term

Type of Autotrophs:

Photoautotrophs

Definition
organisms that use energy from sunlight to convert CO2 and water to carbon compounds
Term

Type of Autotrophs:

Chemoautotrophs

Definition
organisms that make organic molecules from from CO2 using energy from chemical reactions
Term
Cellular respiration
Definition
process that releases energy by breaking down glucose and other food molecules in the presence of oxygen
Term
fermentation
Definition
process by which cells release energy in the absence of O2
Term
obligate aerobes
Definition
organisms that require a constant supply of ixygen in roder to live
Term
obligate anaerobes
Definition
organisms that must live in the absence of oxygen
Term
Facultative anaerobes
Definition
organisms that can survive with or without oxygen
Term
Anerobes preform _______ to release energy and aerobes preform _________ to release energy
Definition
fermentation/ cellular respiration
Term
Binary fission
Definition
asexual reproduction in which an organism replicates it's DNA and divides in half, producing 2 identical daughter calls
Term
Conjugation
Definition
primitive form of sexual reproduction in which the organism exchanges genetic information
Term
Endospore
Definition
type of spore formed when a bacterium produces a thick internal wall that encloses its DNA and a portion of its cytoplasm
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