Question

3 multiple choice 5 points a small hydrophobic substance will likely cross the plasma membrane by which process? simple diffusion secondary active transport facilitated diffusion osmosis 4 multiple choice 5 points a red blood cell placed into a container of distilled (100%) water will ____ water via ____. gain; osmosis lose; diffusion lose; osmosis gain; diffusion

Explanation:

For question 3, small hydrophobic substances can pass through the non - polar lipid bilayer of the plasma membrane without the help of transport proteins, which is simple diffusion. Secondary active transport requires energy and a cotransporter, facilitated diffusion needs a transport protein, and osmosis is specifically for water movement.
For question 4, distilled water has a lower solute concentration than the inside of a red blood cell. Water moves from an area of high water concentration (distilled water) to an area of low water concentration (inside the red - blood cell) by osmosis, so the red blood cell will gain water.

Answer:

1. A. simple diffusion
2. A. gain; osmosis