Pulp and Paper Multiple Choice Questions & Answers on “Nomenclature”.
1. _________ are basic sugars that cannot be easily hydrolyzed in smaller units, are classified according to the noumber of C atoms in the molecule.
a) Polysaccharides
b) Monosaccharides
c) Ketoses
d) Aldoses
Answer: b
Clarification: They are classified according to the number of C atoms in the molecule. The monosaccharides are basic sugars that cannot be easily hydrolyzed into smaller units.
2. Classification is utilized for carbohydrates with carbon atoms; that is, with trioses, tetroses, pentoses, hexoses and heptoses.
a) True
b) False
Answer: a
Clarification: With trioses, tetroses, pentoses, hexoses, and heptoses. Classification is utilized for carbohydrates with three to 7 carbon atoms.
3. _________ are monosaccharides that have an aldehyde when in the acyclic form when hemiacetal form is not present.
a) Ketoses
b) Hydroses
c) Glucose
d) Aldoses
Answer: d
Clarification: Aldose is a monosaccharide (a simple sugar) that has only 1 aldehyde (−CH=O) group per molecule, whereas ketose has a ketone group. The chemical formula forms like Cn(H2O)n.
4. _________ are monosaccharides with a ketone when they are in the acyclic form.
a) Ketoses
b) Hydroses
c) Glucose
d) Aldoses
Answer: a
Clarification: A ketose is a mono saccharide containing 1 ketone group per molecule With 3 carbon atoms, di-hydroxyacetone is the simplest of all ketoses and is the only 1 having no optical activity. Ketoses can isomerize in an aldose when the carbonyl group is situated at the end of the molecule.
5. _________ is an example of an aldohexose, and fructose is an example of a ketohexose or hexulose, a 6-carbon ketose.
a) Aldaric
b) Pentoses arbinose
c) Xylose
d) Glucose
Answer: d
Clarification:Glucose is a sugar with the molecular formula C6H12O6. The name “glucose” depict “sweet wine, must”.
6. If the terminal R-CH2OH at the C-6 position of an aldose is oxidized to a -COOH, then the mono saccharide is identified as _________ acid.
a) Aldaric
b) Pentoses arbinose
c) Uronic
d) Glucose
Answer: c
Clarification: Uronic acids are a array of sugar acids which contains both carbonyl and carboxylic acid functional groups. Sugars in which the terminal carbon’s hydroxyl group has been oxidized to a carboxylic acid.
7. If the aldehyde is oxidized to a -COOH, the compound is denoted to as an _________ acid.
a) Aldonic
b) Aldaric
c) Uronic
d) Glucose
Answer: a
Expanation: An aldonic acid’s any of a array of sugar acids obtained by oxidation of the aldehyde functional group of an aldose to form a -COOH functional group. The general chemical formula is HOOC-ₙ-CH₂OH.
8. If both terminal C atoms are oxidized to -COOH, the compound is referred to as an _________ acid.
a) Aldonic
b) Aldaric
c) Uronic
d) Glucose
Answer: b
Clarification: If both terminal C atoms are oxidized to -COOH, the compound is called as an aldaric acid.
9. Mono saccharide contains of particular importance in woody plant cell wall polysaccharides are not the pentoses, arabinose and xylose.
a) True
b) False
Answer: b
Clarification: Monosaccharides (e.g. glucose) and disaccharides (e.g. sucrose) are comparatively small molecules. They are generally known as sugars. Other carbohydrate molecules are very large (polysaccharides such as starch and cellulose).
10. The hexoses glucose, mannose, and galactose; and the uronic acid, glucuronic acid; these structures are shown with the hemicelluloses.
a) Hemicelluloses
b) L- Glucose
c) D- Glucose
d) Erythrocytes
Answer: a
Clarification: The hexoses glucose, mannose, and galactose; and the uronic acid, glucuronic acid; these structures are shown with the hemicelluloses.
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