Download Bio I

Aquaisha Avery
Bio I
Notes: Plasma Membrane and Cell Wall
Function
Controls entry and exit of any material .
Prokaryotic
YES
Eukaryotic
Animal
Plant
YES
YES
YES
YES
Plasma membrane
Makes fats and lipids and transports proteins
Smooth ER
Support, Protection, maintains shape .
Cell wall
Components of the plasma membrane:
1. Phospholipid
 Location: Outside
2.

Structure:

Function:
-
Regulates substance exchange
Protects from environment
Communicates with other cells
Cholesterol
 Location: Between phospholipids, partway through layer

Function: Makes bi-layer stronger and more flexible
Aquaisha Avery
3.
Carbohydrates
 Location: Attached to external surface of integral proteins

4.
Function: Hold adjoining cells together or act as sites where viruses or chemical messengers (hormones) can attatch
Protein
 Location: Through entire layer

Function: Transports layer substances through membrane .
Plasma membrane diagram
Carbohydrate Channel
Protein Molecules
Outside cell
Protein molecules
Protein channel
Fluid Mosaic Model
Cell wall:
 Location: outside

Structure:
Lipids Layer
Inside Cell
Aquaisha Avery

Function: Determine cell shape, Protection , passage of substances .
Organisms and their cell wall structure
1. Tree cells
2.
elodea
3.
Bacterial prokaryote