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Biology 106 Lab exam 2
Study notes for exam 2
21
Biology
Undergraduate 1
04/18/2017

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Term
Prokaryote
Definition
Species with cells lacking membrane-bound organelles
Term
Eukaryote
Definition
Species with membrane-bound organelles include plants, animals, fungi and protists. 
Term
Colony
Definition

a visible speck or patch of millions of bacterial cells that are typically the progeny of a single cell that reproduces on the agars surface 

Term
Nitrogen fixation
Definition
certain bacteria and cyanobacteria transform atmospheric nitrogen into other nitrogenous compounds that can be used as nutrients by plants
Term
Gram Positive
Definition

bacteria (E.g. streptococcus, micrococcus) have a thick cell wall that retains a purple dye

    

Term
Gram Negative
Definition

(Escherichia coli, serratia) bacteria have a much thinner cell wall that does not retain the dye. 

Term
Bacillus
Definition
Rod- Shaped
Term
Coccus
Definition
Spherical
Term
Spirillum
Definition
Spiral
Term
Sheath
Definition
An enveloping tubular structure, such as the base of a grass leaf that surrounds the stem or the tissue that encloses a muscle or nerve fiber.
Term
Heterocyst
Definition
a large transparent thick-walled cell that is found in the filaments of some cyanobacteria and is the site of nitrogen fixation.
Term
Filament
Definition
is a "long chain of proteins, such as those found in hair, muscle, or in flagella". They are often bundled together for strength and rigidity. 
Term
Trichome
Definition
A hairlike projection from a plant epidermal cell. Examples include root hairs and the stinging hairs of nettle leaves.
Term
Conjugation
Definition

sexual reproduction by laying side by side –horizontal gene transfer    

Term
conjugation tube
Definition
Tube used in conjugation to exchange info
Term
zygote
Definition
diploid formed by gametic fusion
Term
colonies
Definition
formation of algae
Term
daughter colony
Definition
a new colony that is produced initically by a parent colony
Term

Centrate 

Definition

The water leaving a centrifuge after most of the solids have been removed.

 

Term

Pennate    

Definition

bilaterally symmetrical    

Term

Silicon dioxide    

Definition

a hard, unreactive, colorless compound that occurs as the mineral quartz and as a principal constituent of sandstone and other rocks.    

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