Cell structure&Fuction

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

lipid bilayer
is a continuous,oily boundary that prevents the free passage of water-soluble substance.
Wavelength
is the distance from the peak of one wave to the peak behind it.

Electron microscopes
use magnetic lenses to bend and diffract beans of electrons,which cannot be diffracted hrough a glass lense.

Transmission electron microscopes
electron 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.

Organelles
they all start out life with a nucleus and other membrane bounded sacs.

Secretory pathway
moves new polypeptide chains from some ribosomes thriught ERand Golgi bodies.

Endocytic pathway
moves ions and molecules into the cytoplasm.

Nuclear envelope
is a double-membrane system in which two lipid bilayers are pressed against each other.

nucleolus

the construction site.

Chromatin
collection of DNA and all proteins associated with it-


Chromosomes
is double-stranted DNA molecule.


Endoplasmic Reticulum
is a flattened channel that starts at the nuclear envelope and folds back on itself repeatedly in cytoplasm.


Golgi Bodies
organelles in which the membrane channel folds bak on itself

Mitochodrion
is a type of organelle that specializes in ATP formation


Cell Junctions
are molecule structure where cell sends or receives signals .

Basal Body
finished array


pseudopods
false feet