Every cell is covered by a membrane that controls what can enter and leave the cell.
Learning Goal 1b
In all but quite primitive cells, a complex network of proteins provides organization and shape and, for animal cells, movement.
Learning Goal 4a
The genetic information encoded in DNA molecules provides instructions for assembling protein molecules.
Learning Goal 4b
The genetic information encoded in DNA molecules is virtually the same for all life forms.
Learning Goal 8
A living cell is composed of a small number of chemical elements mainly carbon, hydrogen, nitrogen, oxygen, phosphorous, and sulfur. Carbon, because of its small size and four available bonding electrons, can join to other carbon atoms in chains and rings to form large and complex molecules.