Flashcards in Carbs 1 and 2 Deck (56)
Do our bodies utilize D or L sugars?
what is the OH group's linkage if it is below the plane of the sugar?
what is the OH group's linkage if it is above the plane of the sugar?
what type of bonds link sugars?
what sort of group is found on a reducing sugar?
reactive carbonyl (Hemiacetals)
which can reduce metals hence the name
swaps H+ on the carbonyl group with an O
reducing carbon on a sugar
Which end of a oligo or poly - saccharide has the anomeric carbon?
A patient is found to be unable to absorb disaccharides, what could be the issue?
An enzyme in the gut called disaccharidases which are tethered to cells in the lumen and breakdown disaccharides into monosaccharides. this is could be the culprit because we can only absorb monosaccharides
what cleaves an alpha 1,6 bond?
What cleaves an alpha 1,1 bond?
what breaks an beta 1,4 bond?
Lactose = galactose and glucose
what pathways does G6P participate in?
Pentose phosphate pathway
what type of link bonds branches to glycogen molecules?
every polymer of glycogen is attached to _____
which is a protein
what enzyme is responsible for the conversion of G6P to G1P?
what are the building blocks of glycogen?
What starts the seeding process for glycogen?
When glycogenin glycosylates itself by attaching the glucosyl residue of UDP-glucose to the hydroxyl chain of a Ser residue in the protein
What link connects branches to the core glycogen molecule?
glycogen degradation proceeds through a _______ rxn
use of phosphate to break the bond
Why is an ATP not required to make G6P for glycolysis ?
G1P and G6P are energetically equivalent
what is the activity of glycogen phosphorylase?
will cut down the glycogen chains to "limit dextrins"
Glycogen phosphorylase and glycogen synthase are reciprocally regulated.by...
phosphorylation with ATP
When glycogen phosphorylase B is phosphorylated then it is (active/inactive)
Insulin secretion in response to an increase in blood sugar levels induces ...
more GLUT4 receptors to come to the cell surface to increase uptake of glucose
Glucagon signals to the liver result in ...
the conversion of glycogen phosphorylase B to glycogen phosphorylase A and the inhibition of glycogen synthase
Fructose metabolism occurs in ...
What does the Pentose phosphate pathway generate?
5 carbon sugars and NADPH
What intermediate links the Fructose metabolism pathway to Glycolysis?
DHAP - dihydroxyacetone phosphate
Name the three enzymes involved in Fructose metabolism