✅ BIOCHEM - Carbohydrates Flashcards
Empiric formula of carbs
(CH2O)n
Number of sugar units in oligosaccharides
3-10 sugars
Monosaccharides are classified accdg to
Number of carbon atoms
Functional group
Glucose is what type of monosaccharide
Aldose
______ have carbonyl groups at the end
Aldose
_____ have carbonyl groups in the middle
Ketoses
Glucose when oxidized forms
Glucuronic acid
Glucose when reduced form
Sorbitol (alcohol)
What sugars are abundant in humans?
D-sugars
The sugar of the body
D-glucose
What sugar is a constituent of many glycoproteins?
D-mannose
Xylose is found in
Glycoproteins
Neuraminic acid is found in
Proteoglycans
Monosaccharide found in cardiac tissue
Lyxose
How are disaccharides formed?
Condensation of 2 monosaccharides
Bond between disaccharides
Glycosidic bonds
Glucose + glucose
What bond?
Maltose
Alpha 1,4
Glucose + galactose
Lactose
Beta 1,4
Glucose + fructose
Sucrose
Alpha 1,2
Example of an oligosaccharide
Maltotriose
Disaccharide from fungi and yeast. A major source of insect hemolymph.
Trehalose
Polysaccharide of fructose used to determine GFR
Inulin
Bonds of cellulose
Beta 1,4
Other name for mucopolysaccharides
Glycosaminoglycans
2 types of projections in chemical structure
Fisher and hayworth
What are isomers?
Same chemical formula but different structures
Define epimers
Compounds that differe in configuration around only one specific carbon atom with the exception of the carbonyl carbon
Define enantiomers
Mirror images
Designated as levo or dextro
Other name for enantiomers
Stereoisomers
Optical isomers
6 carbon ring
Pyran ring
5 carbon ring
Furan ring
Define anomer
Convertible between a linear form and ring form
Spontaneous interconversion of anomers through a process
Mutarotation
Principal sites of carbohydrate digestion
Mouth
SI
Amylase can digest what type of glycosidic bonds
Alpha 1,4
Pancreatic amylase hydrolyzes complex carbs to what forms
Disaccharides and trisaccharides
But NOT directly to monosaccharides
Disaccharides are digested in the _____
Brush border of the SI
Glut 2 is what type of channel
Facilitated diffusion
Glut 5 utilizes what transport means?
Facilitated diffusion
SGLT 1 is what type of transport?
Secondary active transport
Other name for SGLT 1
Sodium glucose symport
Glut 5 transporter is for all sugars. T or false
False
For glucose, galactose, fructose
SGLT 1 is for what sugars?
Glucose
Galactose
Define glycemic index
Increase in blood glucose after a test dose of a carb compared to that with an equivalent amt of glucose
Lactose intolerance : Asians
Isomaltase-sucrase deficiency : ?
Greenland eskimos
What is the basis for the not giving milk to someone with diarrhea?
Wash off of enzymes transiently
Both anabolic and metabolic pathway
Amphibolic
Example of an amphibolic pathway
Kreb’s Cycle
Most abundant organic molecules in nature
Carbohydrates
Only insulin stimulated glut transporter
Glut 4
Where does glycolysis occur?
Cytoplasm