CELL STRUCTURE AND FUNCTION

 NUCLEOID:
a region of the cytoplasm that is not enclosed in a membranous sac.


 LIPID BILAYER:
 oily boundary that prevents the free passage of water-soluble substances across it.


 WAVELENGTH:
is the distance from the peak of one wave to the peak behind it.


.ELECTRON MICROSCOPES:
 use magnetic lenses to bend and diffract beams of electrons, which cannot be diffracted through a glass lens.




 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 electrons back and forth  across a surface of a specimen.






 ORGANELLES:
 membrane-bounded sac.




SECRETORY PATHWAY:
moves new polypeptide chains from some ribosomes through ER and GOLGI bodies.



 ENDOCYTIC PATHWAY:
moves ions and molecules into the cytoplasm.




 VESICLES:
tiny sacs that act likes taxis and moves substances from one organelle to the next in line.





 NUCLEAR ENVELOPE:
is a double-membrane system in which two lipid bilayer are pressed against each other.



 CHROMATIN:
 as the cell´s collection of DNA and all proteins associated with it.




 CHROMOSOME:
is a double-stranded DNA molecule and its associated proteins.




 PEROXISOMES:
hold enzymes that digest fatty acids, amino acids, and hydrogen peroxide, a toxic metabolic product.





 CELL JUNCTIONS:
are molecular structures where a cell sends or receives signals or materials.




 BASAL BODY:
barrel shaped structure that produces and organizes microtubules into the 9+2 array.




PSEUDOPODS:
or "FALSE FEET"