1. AP Biology Essential Chemistry Packet: Questions 4 & 5
By: Kelly, Amy, Chris, and Josh
Period: 3

2. Question 4: What is the appropriate C:H:O ratio in each of the following types of macromolecules?
Carbohydrates  1:2:1
Lipids (fat)  1:2
Proteins  no rational ratio
Nucleic Acids  no rational ratio
Lipid: Carbohydrate:
H H H H H H H H H OH
| | | | | | | | | |
H-C- C- C- C- C- C-C–C- C-C=O
| | | | | | | | |
H H H H H H H H H

3. Question 5: What other elements are commonly associated with each of these four types of macromolecules?
Carbohydrate
Lipids
Proteins
Nucleic
Acids
Always contains P X
Usually contains no P
Always contains N
Usually contains no N
Often contains S
Rarely contains S