Correctly complete the following statements with a word or term which makes that statement true. (8 pts. @ per blank)

1. _______________ is the movement of materials from a higher to a lower concentration.

2. _______________ transport involves processes such as osmosis and diffusion.

3. _______________ is the pinching in of materials through the cell membrane.

4. _______________ is the engulfing of materials by an organism or a cell with its psuedopodia.

5. _______________ is the diffusion of water.

6. _______________ transport is the movement of materials from lower concentration to higher concentration as in the processes of phagocytosis and pinocytosis.

7. _______________ transport requires energy in the form of ATP to occur.

8. The cell or plasma membrane is composed chiefly of two layers of ______________ with globular ______________ floating in these layers.

9. Most cell membrane _______________ occurs through the proteins embedded in its membrane.

An freshwater organism is placed in a 20% saline solution. (20 pts.)

(a.) Explain why water moves through the cell membrane faster than does the salt in the saline solution.

(b.) Indicate the direction of osmotic flow using a picture.

Now hopefully some correct answers!

1. diffusion or passive transport

2. passive

3. pinocytosis

4. phagocytosis

5. osmosis

6. active

7. active

8. lipids, proteins

9. transport

[Short Answer Question]

a.) Water is better able to fit through the channels in the globular proteins of the plasma membrane as it is a smaller molecule than salt or most other molecules.

b.) The drawing had better show the outward osmosis of the water (which would lead to a shriveling of the cell)