Ochem true or false: 1. All D-sugars are dextrotatory 2. Naturally occurring mon
ID: 837596 • Letter: O
Question
Ochem true or false:
1. All D-sugars are dextrotatory
2. Naturally occurring monosaccharides are typically D-sugars and naturally occurring amino-acids are typically L-amino-acids.
3. Alpha linked polymers of glucose are good energy storage materials.
4. Amyl pectin and glycogen vary only in the distance between branches.
5. Humans can generally break down alpha-linked oligosaccharides of glucose.
6. Ketoses do not mutarotate and are not able to be reducing sugars.
7. Monosaccharides only react as alcohols due to formations of hemiacetals.
8. All unmodified disaccharides are reducing sugars.
9. OH to the right in Fischer Projections of monosaccharides are indicative of R stereocenters
10. It is possible to selectively break or form ethers at the anomeric carbon of a cyclic monosaccharide.
11. Cleavage of acetals in acid can convert a non-reducing sugar to a reducing sugar.
12. Carbohydrates are used as structural materials, signalling molecules, cell identifiers, energy storage, and catalysts in living systems.
13. Amino acids with acidic sidechains have pI
Explanation / Answer
1. F
2. T
3. T
4. F
5. T
6. T
7. F
8. F
9. T
10. T
11. T
12. F
13. F
14. T
15. T
16. T
17. T
18. T
19. F
20. F
21. T
22. T
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