Exam 3: Chp 7

Question 1

What are the 6 main roles of carbohydrates?

Answer 1

Energy stores
Metabolic Intermediates
Nucleic acids
Structural
Cell recognition
Cell signaling

Question 2

What is the basic structure of a carbohydrate?

Answer 2

(CH2O)n

Question 3

What are 4 common features of carbohydrates?

Answer 3

Asymmetric (chiral) center(s)
Linear and cyclic structures
Polymerize via glucosidic bond
H-bond donors and acceptors
Typically water soluble

Question 4

Chemically with functional groups, how are the simple sugars/monosaccharides described?

Answer 4

as polyhydroxy aldehydes or ketones

Question 5

How many carbons are monosaccharides typically in length?

Answer 5

3-7 carbons

Question 6

How are classes of monosaccharides defined?

Answer 6

Function group (ketone or aldose)
Carbon number (triode, tetrose…)
Combination (aldohexose, heptaketose..)

Question 7

What classifies a monosaccharide as a D enantiomer?

Answer 7

If the hy

Question 8

What classifies a monosaccharide as an L enantiomer?

Answer 8

If the hydroxyl of achiral carbon furthest from the aldehyde or ketone is on the left side of of the Fischer projection

Question 9

What shape do monosaccharides favor?

Answer 9

cyclic