What represents the original starting point from which all living things have evolved?

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer

Which of the following requires the use of energy and the of transport proteins to move a molecule across a cell membrane?

Achange in direction without a change in speed is called velocity