This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: -simplest sugars-polyhydroxyaldehydes or polyhydroxyketones many hydroxyl carbonyl group many hydroxyl carbonyl group groups at end groups not at end-the molecules consist of chains of carbon atoms -- all but one of which have a hydroxyl group-the remaining C contains a carbonyl group Function:-mainly as a source of energy Examples: (a) pentoses (5 carbon sugars) 1. ribose (found in RNA) 2. deoxyribose a ribose that lacks one oxygen (found in DNA)-aldehyde (aldose )-aldehyde (aldose )-C 5 H 10 O 5-C 5 H 10 O 4 1. -glucose (alpha-glucose) and -glucose (beta-glucose) -- aldoses 2. -galactose and -galactose -- aldoses 3. fructose -- a ketose In water glucose exists in 3 forms: 0.02% open-chain form, 36% -form and 64% -form -D-glucose (open-chain form) -D-glucose (ring form) 6. | H - C - OH | H- 3 -...
View Full Document