Cell Structure and Function

Nucleoid
A region of the cytoplasm that is not enclosed in a membrane sac.

Lipid Bilager
Is a continuos , oily boundary that preverts the free passage of water soluble substabces.

Wavelenght
Distance from the peak of one wave to the peak behind it.

Electron Microscope
Use magnetic lenses to bend and duffract beams of electrons.

Transmission Electron Microscope
Electrons pass through a specimen and are used to make images of its internal details.

Scanning Electron Microscopes
Direct a beam of electron back and forth across a surface of a specimen.

Organells
Membrane bounded sacs.

Secretory Pathway
Moves polypeptide chians through ER and golgi bodies, then on to the plasma membrane for release from the cell.

Endocytic Pathway
Moves ions and  molecules into the cytoplasm.

Vesecles
Tiny Sacs.

Nuclear Envelope
Is a double-membrane system un which two lipid biliyers are pressed against each other.

Chromatin
As the cells`s collection of DNA and all proteins associated with it.

Chromosomes
Is a double-stranded DNA molecule and its associated proteins.

Peroximes
Hold enzymes that digest fatty acids, amino acids and hydrogen peroxide.

Cell Junctions
Molecular structures where a cell sends and receives signals or materials.

Basal Body
Barrel shaped structure that produces and organizes microtules into the 9+2  array.

Pseudopods
"false" feet. Temporar, irrgular labels bulge out from the cell.