2. Cell Chemistry & Cell Components

The lipids that form the main structural component of cell membranes are __________.

If a small droplet of triacylglycerol molecules is suspended in water, the fat molecules form a "ball of spaghetti" with no particular orientation. But if a droplet of phospholipid molecules is put in water, all the molecules point outward, toward the water. Phospholipids are forced into this orientation because phospholipids have __________.

Which of the following is not a function of lipids in the body?

How do the phospholipids in archaea differ from those in other cells?a. They have tails made of unsaturated fatty acids instead of saturated fatty acids.b. They do not contain hydrocarbon chains.c. They have isoprenoid tails instead of fatty acid tails.d. They have two hydrocarbon chains instead of three hydrocarbon chains.

A fat molecule typically contains how many fatty acids?

What is the primary form of fat stored in our bodies?

Lipids differ from other large biological molecules in that they __________.

Which type of macromolecule stores energy and provides thermal insulation for the body?

Which of the following substances is a major component of the cell membrane of a fungus?a. celluloseb. chitinc. cholesterold. phospholipids

High cholesterol levels are considered a major risk factor for heart disease. If it is so bad for humans, why does the body make cholesterol in the first place?

Which of the following terms is least like the others?a. monosaccharide;b. phospholipid;c. fat;d. steroid;e. lipid

What makes a fatty acid an acid?a. It does not dissolve in water.b. It is capable of bonding with other molecules to form a fat.c. It has a carboxyl group that can donate an H+ to a solution.d. It contains only two oxygen atoms.