Cell Structure and Function

Nucleoid

region of the cytoplasmthat is not enclosed in a membrenous sac.

Lipid Bilayer

a continous, oily boundary that prevents the free passage of water soluble substance across it
Wavelenght

distance from the peak of one way to the peak behind it
Electron Microscope

uses magnetic lenses to bend and diffract beams of electrons
Transmision Electron Microscope

electron pass through a specimen and are used to make images of its internal details
Scanning Electron Microscope

direct a beam of electrons back and forth across a surface of a specimen
Organelles

start out life with a nucleus and other membrane bounded sacs
Secretory Pathway

move polypeptide changes from one ribosome through ER and golgi body
Endocytic Pathway

move ions and molecules into the cytoplasm
Vesicles

tiny sacs
Peroxisomes

hold enzymes that digest fatty acids, amino acids, and hydrogen peroxide
Cell Junctions

molecular structure were a cell sends or receives signals of materials
Basal body

barrel shaped structure that produces and organizes microtubules
Pseudopods

false feet
Nuclear envelope

a double membrane system
Chromatin

a cell collection of DNA
Chromosome

a double-standed DNA molecule and its associated proteins