The next 4 questions are each based on recent New York Times articles discussed in class. Osmosis applies only to certain special cases involving the movement of water across plasma membranes. Generally speaking, RNA is one molecular strand while DNA has two strands twisted to form a helix. Oxygen building to hemoglobin molecules in red blood cells requires that oxygen first move through the cell membrane. Units which most accurately describe sizes of body cells.
Enzymes are usually small relative to their substrates.