100 Points Help Fill in the gaps with a correct word.

1. The plasma membrane is composed primarily of . Other components include , and .

2. Each phospholipid consists of:
A. A polar head that is or “water loving”.
B. Two non-polar hydrocarbon tails that are or “water fearing”.

3. The phospholipids arrange themselves into a (or two layers).

1. The plasma membrane is composed primarily of phospholipids Other components include embedded protein, carbohydrates and Cholesterol.

2. Each phospholipid consists of:

A. A polar head that is Hydrophilic or “water loving”.

B. Two non-polar hydrocarbon tails that are hydrophobic or “water fearing”.

3. The phospholipids arrange themselves into a phospholipids and sterols (or two layers).

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.