1. Biochemistry: Molecules of Life
ORGANIC COMPOUNDS
Contain carbon
Most are covalently bonded
Examples
Carbohydrates
Lipids
Proteins (includes vitamins)
Nucleic Acids
ATP

2. Carbohydrates “Carbs” Objective:
B2 - Compare the structures & functions of carbohydrates, lipids, proteins, & nucleic acids & their organization into long complex molecules

3. Function:
Main energy source (quick energy)
Consist of:
Carbon (carbo-),
Hydrogen and Oxygen (-hydrate, the atoms in water)
Carbohydrates can be divided into three main groups: simple sugars
storage carbohydrates
structural carbohydrates

4. Simple Sugars
Monosaccharides (mono- means one) (saccharide is Greek for “sweet” or “sugar”)
glucose (blood sugar and a product of photosynthesis)
fructose (fruit sugar)
Disaccharides (di- means two) monosaccharides connected together
sucrose (table sugar)
lactose (milk sugar)
C6H12O6
lactose

5. Polysaccharides many sugars chained together
can either be a storage or a structural carbohydrate

6. Storage Carbohydrates
are simply that, they store the sugar
generally long chains (upwards of 1,000 or more) of glucose (When the body needs sugar (quick energy), it simply “plucks” a sugar off. Kind of like plucking of single grapes from a cluster. You eat one at a time, not the whole cluster at once)
In plants it’s called starch (potatoes, bread, rice)
In animals it’s called glycogen
However, they are not the same molecule. Starch is a long chain of glucose, but glycogen is more of a “cluster” as it has many branched chains of glucose. Yet both are polysaccharides of glucose.
If glucose were not stored this way, then all the glucose in the cell would be consumed very quickly. But when stored in chains, the glucose is “safe” and is only used when needed.

7. Structural Carbohydrates
used to provide structure for the organisms in which they’re found
Cellulose (in the cell walls of plants)
Chitin (in the cell walls of fungi)
(ID badges on the cell membrane)

8. Identifying Carbohydrates
Roughly 90% of the time a carbohydrate ends in “-ose”
Examples: glucose, fructose, galactose, sucrose, lactose, maltose, cellulose, ribose, deoxyribose, etc.

9. In conclusion…
monomer (monosaccharide)
polymer (polysaccharide)

11. POLYSACCHARIDES IN ANIMALS. glycogen-animal starch, stores energy
POLYSACCHARIDES IN ANIMALS * glycogen-animal starch, stores energy * in arthropods, makes up the exoskeleton
POLYSACCHARIDES IN PLANTS * starch! made from plants that put together glucose * cell walls are made of cellulose