Cell Structure and Fuction

Cell: is the smallest unit with the properties of life.

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

Lipid bilayer: is a continous, oily boundary that prevents the free passage of water-soluble substances across it.

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

Transmission electron microscope: are used to make images of its internal details.

Sacnning electron microscopes: direct a beams of electrons back and forth across a surface of a specimen, which has been given a thin metal coating.

Organelles: membranous sacs.

Secretory pathway:moves new polypeptide chains from some ribosomes through ER and Golgi bodies, then on the plasma membrane for release from the cell.

Endocytic pathway:moves ions and molecules into the cytoplasm.

Vesicles: tiny sacs.

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

Chromatin: the cell collection of DNA and all proteins associated with it.

Chromosome: is a double-stranded DNA molecule.

 

Peroximes: hold enzymes that digest fatty acids, amino acid, and hydrogenperoxide.

Cell junctions: are molecular structures where a cell sends or receives signals or materials, or recognizes and glues itself to cells of the same type.

Basal body: an organelle that started out as a centriole, the source of a 9+2 array of microtubules in a cillium or flagellum. It remains below the finished array.

 

Pseudopods: false feet.