Ribosome are where RNA is translated into protein. This process is called protein synthesis. Protein synthesis is very important to cells, therefore large numbers of ribosomes are found in cells. Ribosomes float freely in the cytoplasm, and are also bound to the endoplasmic reticulum (ER).
Hydrophilic heads, hyrdophobic tails. Heads are made of phosphate and the tails are made of lipids.
Number 4 should be mitosis
