This set of Food Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Carbohydrates – Monosaccharides”.
1. Which of the following is the most basic unit of carbohydrates?
a) Disaccharide
b) Monosaccharide
c) Trisaccharide
d) Table sugar
View Answer
Explanation: Monosaccharides also called simple sugars are the most basic units of carbohydrates. They are fundamental units of carbohydrates and cannot be further hydrolyzed to simpler compounds.
2. Which is the general formula of monosaccharides?
a) CnH2n+2On
b) CnH2nOn-2
c) CnH2nOn
d) C2nH2nOn
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Explanation: The general formula is CnH2nOn. They are the simplest form of sugar and are usually colorless, water-soluble, and crystalline solids. Some monosaccharides have a sweet taste.
3. Which of the following is another name for glucose?
a) Dextrose
b) Levulose
c) Galactose
d) Disaccharide
View Answer
Explanation: Another name for glucose is Dextrose.
4. Which of the following is another name for fructose?
a) Dextrose
b) Levulose
c) Galactose
d) Disaccharide
View Answer
Explanation: Another name for fructose is levulose.
5. D-Alanine and L-Alanine are technically known as what?
a) Enantiomers
b) Epimers
c) Polymer
d) Anomers
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Explanation: Enantiomers are D and L isomerism monosaccharide containing from 1,4 chiral center which therefore has different optical isomers.
6. Monosaccharides having chemical Cx(H2O)y, where x is equal to what?
a) x = 5
b) x = 10
c) x ≥ 3
d) x = 0
View Answer
Explanation: Monosaccharide have this chemical formula: Cx(H2O)y, where conventionally x ≥ 3. Monosaccharides can be classified by the number x of carbon atoms they contain: triose (3) tetrose (4), pentose (5), hexose (6), heptose (7), and so on.
7. The most important monosaccharide is what type of monosaccharide?
a) Hexose
b) Triose
c) Pentose
d) Heptose
View Answer
Explanation: The most important monosaccharide, glucose, is a hexose. Examples of heptoses include the ketoses mannoheptulose and sedoheptulose.
8. Monosaccharides with eight or more carbons are rarely observed.
a) True
b) False
View Answer
Explanation: Monosaccharides which have eight or more carbons are hardly observed because they are very unbalanced.
9. Monosaccharides with four or more carbons have more than two stereoisomers.
a) True
b) False
View Answer
Explanation: Monosaccharides which contain four or more carbons may have multiple chiral carbons, so they have more than two stereoisomers. The number of distinct stereoisomers with the same diagram is bounded by 2c, where c is the total number of chiral carbons.
10. Which one of the following is not an amino sugar?
a) Galactosamine
b) Glucosamine
c) Sialic acid
d) Sulfoquinovose
View Answer
Explanation: Sulfoguinovose is a sulfosugar while all others are amino sugars. They are all derivatives of monosaccharides.
Sanfoundry Global Education & Learning Series – Food Chemistry.
To practice all areas of Food Chemistry, here is complete set of Multiple Choice Questions and Answers.
