Question

1. fatty acids contain - hydrogen bonds, making them. the phosphate \head\ in a phospholipid is. the entire phospholipid molecule, therefore, is

carbon; hydrophobic; hydrophilic; amphiphilic
a.
b. hydrogen; hydrophilic; hydrophilic; amphiphilic
c. carbon; hydrophilic; hydrophilic; hydrophobic
d. hydrogen; hydrophobic; hydrophobic; hydrophobic

1. the image below represents a type of lipid molecule. it is identifiable by two characteristic smaller molecules. identify the lipid and the smaller molecules.

biglyceride; glucose, fatty acids
a.
b. triglyceride; glycerol, fatty acids
c. triglyceride; glycerol, phospholipid
d. fatty acid; glucose; triglyceride

1. image #1 below is of a(n) fatty acid, identifiable because of its bond(s). image #2 below is of a(n) fatty acid because of its bond(s).

saturated fat; double; unsaturated fat; single
a.
b. saturated fat; single; unsaturated; double
c. unsaturated; double; saturated; single
d. unsaturated, single; saturated; double

Explanation:

• Question 27: Fatty acids contain carbon - hydrogen bonds. The hydrocarbon tails (fatty acid part) of phospholipids are hydrophobic (due to non - polar carbon - hydrogen bonds), and the phosphate "head" is hydrophilic (polar). Since a phospholipid has both hydrophobic and hydrophilic parts, it is amphiphilic.
• Question 28: Triglycerides are made up of one glycerol molecule and three fatty acid molecules.
• Question 29: Unsaturated fatty acids have double bonds (which cause bends in the chain as seen in Image #1), while saturated fatty acids have only single bonds (straight - chain structure as in Image #2).

Answer:

1. a. carbon; hydrophobic; hydrophilic; amphiphilic
2. b. triglyceride; glycerol, fatty acids
3. c. unsaturated; double; saturated; single