CHAPTER 7 SECTION 2 SECTION QUICK CHECK AND STUDY GUIDE FOR SECTION 2
SECTION QUICK CHECK
Page 60 • Section 2
1. cholesterol, proteins, and carbohydrates
2. A phospholipid is a molecule that has a glycerol
backbone, two fatty acid chains, and a phosphatecontaining compound. The plasma membrane
is made of two layers of phospholipids that are
arranged tail-to-tail.
3. The primary function of the plasma membrane
is to maintain homeostasis by providing a thin,
flexible boundary between a cell and its watery
environment. The plasma membrane allows
nutrients to enter the cell and allows waste and
other products to leave the cell.
4. If the plasma membrane of a cell lost its selective permeability, it would no longer be able to
control the movement of substances in and out
of the cell. Waste products might build up inside
the cell, the cell might not be able to take in
nutrients, and the cell might take in excess water
or harmful substances from its environment.
5. The surface of the plasma membrane can be
described as a mosaic because different substances float around within the plasma membrane, creating a pattern on the membrane’s
surface.
SECTION STUDY GUIDE
Page 52 • Section 2
1. Homeostasis
2. Plasma Membrane
3. Selective Permeability
4. Plasma Membrane
5. Selective Permeability
6. Homeostasis
7. carbohydrate chain
8. transport protein
9. polar head
10. nonpolar tails
11. B
12. C
13. A
14. E
15. D