Carbohydrates Lecture 10 0.0 / 5 ? AllCarbohydratesUniversityAll boards Created by: sisqoCreated on: 29-11-22 13:25 What are five major roles of carbohydrates? Storage and transport of energy Cell to cell communication Host pathogen + host symbiont interactions Structural Components of DNA and RNA 1 of 12 Which two functional groups can a carbohydrate have? Ketone [R] or aldehyde [H] 2 of 12 What are the 2 simplest carbohydrates that have 3 carbons and which one has stereoisomers Glyceraldehyde (2 stereoisomers as its attached to four different groups) and dihydroxyacetone. 3 of 12 What is a chirally active carbon? When its attached to four different groups. 4 of 12 Why do sugar rings form? The alcohol –OH is on the same molecule as the ketone and aldehyde 5 of 12 What is an anomer and why do they form? When a sugar ring is formed an additional asymmetric carbon is formed which gives to alpha and beta forms of the sugar 6 of 12 Which enantiomer of sugars are found naturally? D 7 of 12 What is it called when the carbon futhest from the aldehyde or ketone has a different stereochemistry Its called the D or L form. D form – carbon on the right. L form on the left 8 of 12 What happens when only carbon 2,3,4 seems to be an isomer? It’s a different sugar 9 of 12 Which two forms of glycosidic bonds exist? Alpha and beta 10 of 12 How many sugars to form oligosaccharide 2-10 11 of 12 What is the difference between an alpha and beta glycosidic bond Alpha is when both joining carbons have the same sterochemistry. Beta – carbons are different. 12 of 12
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