Which macromolecule forms a double layer as the primary structure of cell membranes? fats oils phospholipids steroids

Describe the function of the endomembrane system? what organelles are involved?

Suppose you are provided with an actively dividing culture of e. coli bacteria to which radioactive thymine has been added. what would happen if a cell replicates once in the presence of this radioactive base?

Si units are the modern form of the