1. What Else Is Inside Cells?

2. Water About two-thirds of the human body is water.
- Chemical Compounds in Cells
Water
About two-thirds of the human body is water.
Most chemical reactions within cells could not take place without water.
Helps cells keep their size and shape.

3. Elements and Compounds
- Chemical Compounds in Cells
Elements and Compounds
Carbon dioxide, which is found in gas bubbles, is a chemical compound. So is water.

4. Comparing and Contrasting
- Chemical Compounds in Cells
Comparing and Contrasting
Type of Compound
Elements
Functions
Store and provide energy and make up cellular parts
Carbon, hydrogen, oxygen
Carbohydrate
Make up much of the structure of cells and speed up chemical reactions
Carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur
Protein
Store energy
Make up cell membranes
Carbon, hydrogen, oxygen
Lipid
Carbon, oxygen, hydrogen, nitrogen, phosphorus
Make up DNA and RNA—instructions to carry out life processes
Nucleic Acids

5. Graphic Organizer Organic Compounds Carbo-hydrates Nucleic acids
types
made of
include
Organic Compounds
Carbo-hydrates
Nucleic acids
Lipids
Proteins
Fats, oils, and waxes
Amino acids
Sugars
Starches
DNA
RNA