Prokaryotic cells typically have

What primarily makes up the cell membrane?

Which type of bond is formed when one atom donates an electron to another?

Even very simple, single-celled organisms are remarkably complex.

All lipids are soluble in water.  

A hypothesis must be:

Water is an excellent solvent for polar substances.

Biology is the science that studies:

Lipids are characterized by being

The atom is the smallest and most fundamental unit of matter that retains the properties of an element.