CHEM 53.10 - Disaccharides

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28 Terms

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Disaccharide
Two monosaccharides formed when the anomeric carbon of one sugar molecule bonds with one of the hydroxyl groups of another monosaccharide
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False
T or F: The bond between the anomeric carbons and the hydroxyl group is a hydrogen bond
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Sucrose, maltose, lactose
Most common disaccharides in nature
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Lactose
Carbohydrate found only in lactating mammary glands
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False
T or F: Lactose can be directly absorbed into the bloodstream
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Galactose, glucose
Two types of D-sugars found in lactose
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C1, C4

Based on the name of lactose, what carbons are connected?

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False

T or F: Based on this chair conformation of lactose, the anomeric carbon of glucose lost its B-hydroxyl group during condensation:

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Beta

The structure shows the ___ (alpha/beta) anomer of lactose:

<p>The structure shows the ___ (alpha/beta) anomer of lactose: </p>
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True
T or F: The alpha anomer and beta anomers of lactose exist in equilibrium
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False
T or F: Lactose can have either an alpha or beta glycosidic bond
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True
T or F: Lactose is a reducing sugar
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Free anomeric carbon, glucose
Lactose is a reducing sugar because it has ___ on (what molecule) ___
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Maltose
Type of sugar you can find in beer
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Maltose
Type of sugar that comes out when you hydrolyze starch
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Glucose
Maltose is composed of what two monosaccharide residues ___
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False
T or F: Maltose is not a reducing sugar
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False
T or F: The alpha anomer of Maltose exists more in abundance than its beta anomer
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True
T or F: Like lactose, maltose is joined by an O-glycosidic bond and linked through alpha-1-4
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Sucrose
Most abundant disaccharide in nature
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Sucrose
Sugar whose common name is table sugar
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True
T or F: Sucrose needs to by hydrolyzed in the intestine before the bloodstream can absorb it
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D-glucose, D-fructose
The two monosaccharide residues of sucrose
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False
T or F: Sucrose is joined by C1 and C4
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True
T or F: Lactose and maltose only has 1 anomeric carbon involved in the glycosidic bond. Sucrose has both.
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True
T or F: Sucrose cannot mutarotate.
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False
T or F: Sucrose cannot equilibrate between its alpha and beta anomers.
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False
T or F: Sucrose is a reducing sugar.