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Prokaryotic Cells
Osmosis
52
Microbiology
Not Applicable
01/29/2015

Additional Microbiology Flashcards

 


 

Cards

Term

Reproduction

 

Definition

Binary Fission


1.) Cell replicates DNA

2.) Cytoplasmic membrane elongates; DNA seperates

3.) Crosswalls form; membrane invaginates

4.) Cross walls form completely

4.)Daughter cell may replicate.

 

Term
Snapping Division
Definition

Subset of binary fission


-crosswalls dont form properly

-only happens for gram positive bacillus rod


-form v shape of palisade


Term
Budding
Definition

1.) Nucleiod replicates

2.)New nucleiod moves into bud

3.) Young bud forms

4.) Daughter cells

Term
Coccus
Definition
[image]
Term
Bacillus
Definition
[image]
Term
Spirillum
Definition

-Stiff spiral. Bacteria is actually spiral shaped

[image]

Term
Spirochete
Definition
Takes spiral size when flagella flips around it
Term
Pleomorphic
Definition

-often lack cell wall

-mishapen

Term
Diplococci
Definition

-cocci arrangements

-group of two

Term
Streptococci
Definition

-cocci arrangement

-long chain

Term
Tetrads
Definition

-cocci arrangements

-group of four square

Term
Sarcina
Definition

-cocci arrangement

-cube 3-demensional

Term
Staphylococci
Definition

-cocci arrangement

-great cluster

Term
Bacillus Arrangements
Definition
[image]
Term
Glycocalyces
Definition

External sructure made of polysacccharide and proteins (sticky)


Functions:

1.) Works to prevent dessications(drying out)

2.) Works to provide ultraviolet protection(sunscreen)

3.) Allows cell to cell or cell tp surface adherance

4.) sequesters nutrients

Term
Capsule
Definition

-type of glycocalyx

"like camoflague"

-solid,complete,sugar coating

-helps bacteria elude immune system

Term
Slime Layer
Definition

-type of glycocalyx

-loose diffuse layer

-this, mucousy

-biofilm formation-permanantly attaches bacteria to surface

Term
Flagella
Definition

-external structure of prokaryotes

Function:

Propel bacteria forward by reversible rotation

Clockwise:Tumbles

Counterclockwise: Runs

Term
Taxi
Definition
-when bacteria moves in response to a stimuli
Term
Phototaxis
Definition
light stimuli
Term
Chemotaxis
Definition
reponse to a chemical
Term
Positive/Negative Stimuli
Definition

Positive: more runs then tumbles

Negative: more tumbles,fewer runs

Term

Flagella

3 parts

Definition

1.) Filament: long whip like structures; made of protein called flagellin

2.) Hook: Intermediate portion; connection of filament and basal body

3.) basal Body: Anchor; made up of rod and disks in cell wall

Gram positive=2 disks

Gram negative=4 protein disks

Term
Flagella Arrangements
Definition
[image]
Term
Fimbriae/Attachment
Definition

-numerous, cover outside of cell

-provide slight movement(they twitch)

-aide in attachment(sick very easily-make initial attachment)

Term
Conjugation or Sex pili
Definition

-forn a bridge that connects two bacteria cells together. Allows for genetic information transfer

 

Plasmid: shared genetic info

Term

Cell Envelope

2 basic layers

Definition

1.) Cell wall: very few do not have

2.) cell Membrane: every bacteria/cell has one.

Term
Peptidoglycan
Definition

-cell wall

-sugar backbone

-strong but flexible

-prevents lysis

-maintains shape

Term

Prokaryotic cell wall

Gram Postive

Definition

1.)Very thick peptidoglycan layer

2.) Contains Techoic acid(gives negative charge and offers support)

3.) Lipoteichoic acid: attach cell wall to membrane

4.) has tetrapeptide bridge and glycan linkage

Term

Prokaryotic Cell Wall

Gram negative

Definition

-thin layer of peptidoglycan layer between two cell membranes

-LPS outside membrane;gives negative charge;contains antigen o and lipid a

-Periplasmic space contains enzymes

Term

Gram + /Gram - staining

Crystal Voilet Dye

Definition

1.)-attaches to the negative charge of the gram positive and negative; dye is positively charged

-Gram positive attaches to teichoric acid

-Gram negative attaches to LPS

2.) Gram Iodine: Mordant "cement" together. Helps anchor dye.

3.) Alcohol: Keeps purple dye in positive, gram negative becomes colorless

4.) Safrinin: counterstain. reddish/pink dye added to gram -: red/pink. Gram postive:remains purple

 

Term
Acid Staining
Definition

-Differential stain to distinguish between 2 gram positive

-Composed of Mycolic acid(acid fast)

 

Term
How does acid fast staining work
Definition

1.)Carbol Fuchsin: Primary dye (stains both acid fast and non acid fast)

Hot Pink


2.) Decolorize with acid: Differential step. Acid fast-hot pink. Nonacid fast- colorless.


3.) Methylene blue/green: Counterstain- blue or green non acid fast

Term
Hopanoid
Definition

-stabalizes bacteria that lack a cell wall.

-prevents cell membrane from becoming to fluid under high temps

-prevents membrane from becomming rigid when temps are cold


Pleomorphic: variety of shapes

ex.) Mycoplasm-walking pneumonia

Term

Diffusion

 

Definition

-High concentration to low concentration

-does not use atp

 

Term
Facilitated Diffusion
Definition

-Uses integral proteins.

>Channel proteins:only open to specific molecules

>Carrier Proteins: allow anything based on size and shape

 

 

 

*high concentration to low concentration

Term

Osmosis

 

Definition

-movement of water

 

Isotonic: same water and particles

Hypertonic: Less H2O more particles

Hypotonic: more H2O less particles

Term

Active Transport

Modified Carrier Proteins

Definition

Uniport: one molecule to come through in one direction


Antiport: 2 molecules in seperate directions


Symport: moves 2 molecules in same direction

Term
Cytoplasm of Prokaryoted
Definition

Cytoplasm: Gelatinous semi transparent elastic aqueous solution

Term
What's in Cytoplasm
Definition

-cytosol

-inclusions

-dna

-plasmids

-endospores

-cytoskeleton

-ribosomes

Term

Cytosol

in cytoplasm

Definition

-composed mostly of water

-contains: ions, carbohydrates, proteins, enzymes, lipids, and waste

Term

Inclusions

in cytoplasm

Definition

-storage unit= stores excess nutrients and gas

-holds things for bacteria cells


-PHB: lipid polymer-similiar to plastic but biodegradeable

-Glycan: glycogen polymer-stores sugars

Term
Prokaryotic DNA
Definition

located in nucleoid

-does not have lipid bilayer

Term
Plasmids
Definition

EXTRA PIECE OF PROKARYOTIC DNA

-mostly in bacteria cells

-part of cytoplasma

-provides antibiotic resistance(makes bacteria virulent)

Term

Cytoskeleton

 

Definition

-part of cytoplasma

-forms cells basic shape

-made of actin

-helps cell divide during binary fission

Term

Ribosome

 

Definition

produce proteins

-DNA---->MRNA---->Protein

                               ^              ^

                       transcription    Translation

 

Size: 70S

Large subunit: 50S

Small subunit: 30S

Term
Biofilm
Definition

-bacteria collection of microorganisms that grow together and have a symbiotic relationship

-discovered by: Leeuwenhoeke

- contains bacteria that causes disease and infection

Term
Where do biofilms form?
Definition

-living tissue

-medical devices

-industrial water

-natural water systems

-anywhere that is moist

Term
Cell Wall
Definition
-allows bacteria to survive in a hypotonic environement
Term
Endospores
Definition
-dormant structures produced by stressed bacteria
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