Cytoplasm
* the semifluid substances
* enzymes and other proteins
* carbohydrates
* lipid and a variety of inorganic ions
Ribosomes
* ribonucleic acid and protein
* 70S: (30S and 50S) S = sedimental rate
* streptomycin and erythromycin, bind specifically to 70S ribosome and disrupt protein synthesis.