5. Molecules of Microbiology

Which type of fatty acids only contain Carbon-Carbon single bonds?

a) Unsaturated.

b) Saturated.

c) Trans fats.

d) Steroids.

A triglyceride is a form of _______ composed of ___________.

a) Lipid ; fatty acids & Glucose.

b) Lipid ; Fatty acids & Glycerol.

c) Carbohydrate ; Fatty acids only.

d) Lipid ; Ribose.

How do phospholipids interact with water molecules?

a) The polar heads avoid water; the nonpolar tails attract water (because water is polar and opposites attract).

b) Phospholipids do not interact with water because water is polar and lipids are nonpolar.

c) The polar heads interact with water; the nonpolar tails do not.

d) Phospholipids dissolve in water.

The molecule shown the figure is a ________.

a) Fatty acid.

b) Wax.

c) Steroid.

d) Triacylglycerol.

e) Phospholipid.

Choose the correct statement about biological waxes:

a) They contain at least one steroid molecule.

b) They are fatty acids bound to long chain alcohol molecules.

c) They are extremely hydrophilic.

d) They are made of 4 fused carbon ring molecules.

DRAW IT Draw a simple lipid, and show how it could be modified to a phospholipid.

Complete the table: <IMAGE>

Cholesterol is best described as

a. a lipid.

b. a sterol.

c. an alcohol.

d. a fat.

e. a wax.

Label the following fatty acids as saturated, monounsaturated, or polyunsaturated. <IMAGE>

Which of the following are hydrophobic organic molecules?

a. proteins

b. carbohydrates

c. lipids

d. nucleic acids

Describe the difference(s) among saturated fatty acids, unsaturated fatty acids, and polyunsaturated fatty acids.