Organization of Cell Membrane

Fluid Mosaic Model:
Is a mosaic composition of phospholipid.

Transport Proteins:
Let specific solutes diffuse through a membrane spaning channel.

Receptor Protein:
Bind extracellular substances.

Recognition Proteins:
Identify tags for each specie.

Adhesion Proteins:
Help cells of the same type to locate each other remain the proper tissue.

Communication Protein:
Form channels that match up across the plasma membranes of two cells.

Concentration Gradient:
Differences in number per unit volume of molecules a substance between two adjoining regions.

Diffusion:
Is the name for the net movement of like molecules or ions down concentration gradient.

Electric Gradient:
Is a difference in electric charge between adjoining regions.

Pressure Gradient:
Difference in pressure exerted per unit volume between two adjoining regions.

Osmosis:
The diffusion of water across a selectively permeable membrane.

Hypotonic Solution:
The one with fewer solution.

Hypertonic Solution:
The one having more solutes.

Isotomic Solution:
No net osmotic movement.

Hydrostatic Pressure:
Pressure against the wall or membrane that contains it.

Osmotic Pressure:
One measure or the tendency of water to follow its water concentration gradient.

Endocytosis:
A small patch of plasma membrane.

Exocytosis:
A vesicle moves to the cell surface and then the protein-studded lipid bilayer of its membrane.

Phagocytosis:
Is a common endocytic pathway.

Plant and Animal cell

Nucleoid:
Is a region of the cytoplasm that is not enclosed in a membraneous sac.

Lipid Bilayer:

Is a continuos, oily boundary that prevents the free passage of water-soluble substances across it.

Wavelenght:
Is the distance from the peak of one wave to the peak behind it.

Electron Microscopes:
Use magnetic lenses to bend and different beams of electrons.





Transmission Electron Microscopes:

Is when the electrons pass through a specimen and are used to make images of its internal details.

Scanning Electron Microscopes:
Direct a beam of electrons back and forth across a surface of a specimen

Organelles:

Are membrane sacs.

Secretory Pathway:
It moves new polypeptide chains from some ribosomes through ER and golgi bodies.



Vesicles:

Are tiny sacs that act like taxis and move substances from one organelle th the next in line.

Nuclear  Envelope:
Is a double-membrane system in which two lipid bilayers are pressed against each other.

Chromatin:
Is the cell's cellections of DNA and all proteins associated proteins.

Chromosome:
Is a double stranded DNA molecule and its associate proteins.

Peroxisomes:

It hold enzymes that digest fatty acids.

Cell Junction:

Are molecular structure where a cell sends or receives signals or materials.

Basal Body:
An organelle that started out as a centriole,it remains below the finished array.

Pseudopods:

Is a foble feet formed by macrophages and amoebas.