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Multiple questions on monosaccharides, carbons, and sugars

I need the following questions answered in the next 45 minutes Thanks

Sucrose is hydrolyzed to what two monosaccharides?
1. glucose and fructose
2. glucose and galactose
3. galactose and fructose
4. glucose and maltose

Question 2
All chiral D-sugars rotate plane-polarized light
1. clockwise
2. counterclockwise
3. in a direction that cannot be predicted but must be experimentally determined
4. not at all as they are optically inactive

Question 3
Stereoisomeric aldohexoses that differ in configuration at only a single carbon are
1. epimers
2. meso
3. enantiomers
4. anomers

Question 4
When a monosaccharide reacts to give the pyranose form from its open-chain form, how many distinct pyranose forms are possible?
1. 1
2. 2
3. 2n where "n" is the number of carbons present
4. 4

Question 5
Cellulose and amylose are
1. 1,4' linked polymers of D-glucose which differ in the stereochemistry of this linkage
2. 1, 6' linked polymers of D-glucose which differ in the stereochemistry of this linkage.
3. synonyms of the only polymeric form of D-glucose
4. polymers of totally different monosaccharides

Solution Preview

Question 1: Sucrose is hydrolyzed to what two monosaccharides?
1. glucose and fructose
2. glucose and galactose
3. galactose and fructose
4. glucose and maltose

Response: Sucrose is a disaccharide made up of the two monosacchides glucose and fructose.

Question 2: All chiral D-sugars rotate plane-polarized light
1. clockwise
2. counterclockwise
3. in a direction that cannot be predicted but must be experimentally determined
4. not at all as they are optically inactive

Response: D and L are not the same as d and l. "d" and "l" are designations that are sometimes used to refer to the direction of rotation of the plane of polarization of plane-polarized light. On the other hand, a monosaccharide belongs to the D-series if the hydroxyl group on the chiral carbon farthest from carbon 1 is on the right in a Fischer projection. If the OH on the last chiral carbon is projected on the left, ...

Solution Summary

Multiple choice questions on various aspects of sugars, monosaccharides, and carbons.

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