Which of the following statements is true regarding active transport? A. It does not use any of its own energy.
B. It uses some of its own energy.
C. It uses energy from other cells.
D. It uses the energy stored mainly in the nucleus.

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