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The flashcards below were created by user
Skitty2004
on FreezingBlue Flashcards.
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What is true about naturally occurring monosaccharides?
- D-isomers predominate
- D,L do not specify the sign of rotation of plane-polarized light
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The intramolecular cyclization reaction of glucose in solution ______.
generates an asymmetric carbon
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What specific bond links the monomers of cellulose?
B(1-4) glycosidic
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Isomers of monosaccharides that differ only in their configuration about the asymmetric carbon are called _____.
anomers
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Hydrolysis of lactose will yield _____.
glucose and galactose
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The cell wall in Gram-negative bacteria consists of two lipid bilayers with ____ between the two bilayers.
peptidoglycan
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The O-glycosidic linkage commonly occurs through ___ residues.
serine
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Amylose has more non-reducing ends than amylopectin.
False
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_____ is the most abundant natural polymer in the world.
Cellulose
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Glycosaminoglycans are linear chains of repeating disaccharides in which one unit is an amino sugar and one or both is negatively charged. [T/F]
True
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D-amino acids are often found in...
peptidoglycans
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Name the following molecule.
Phosphotidlycholine
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______ cleave fatty acids or polar head groups from a glycerophospholipid, producing lysophospholipids, phosphodiaclyglycerols or diacylglycerols.
Phospholipases
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Dihydroxyacetone is an aldotriose. [T/F]
F
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The intramolecular cyclization reaction of glucose in solution generates an asymmetric carbon yielding a cyclic hemiacetal. [T/F]
T
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The anomeric carbon in glucose is found at the ___ position.
C-1
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An amino sugar has a ____ group at the C-2 position, as in glucosamine.
NH2
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Anylose and amylopectin of starch are each composed of ____ residues.
Glucose
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Glycogen is similar to amylopectin but also contains galactose residues and is more highly branched. [T/F]
F
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The phosphorylase enzyme releases the carbohydrate on the ___ end.
non-reducing
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Which is more heavily branched? Starch of glycogen?
glycogen
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Heparin is a glycosaminoglycans. [T/F]
True
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In what compounds are D-amino acids an important constituent?
peptidoglycans
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N-linked saccharides are attached via the ____ nitrogens of _____ residues.
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