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Carbohydrates_Chemistry_MCQs
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.DR. ZEYAD SAEED |د زياد سعيــــد 1
Carbohydrates Chemistry MCQs Collection
1. About carbohydrates:
a) derivatives of carbohydrates contain only carbon, hydrogen and oxygen
b) monosaccharides are soluble in nonpolar solvents.
c) monosaccharides can be hydrolyzed into simpler compounds
d) the number of stereoisomers depend on the number of chiral carbon atoms
2. About carbohydrates:
a) oligosaccharides consist of long chains of more than 10 monosaccharide units
b) all polysaccharides are linear chains
c) heteropolysaccharides contain only a single monosaccharide
d) a heptose sugar contains 7 carbon atoms
3. Which of the following is an aldotetrose:
a) glyceraldehyde b) erythrose c) mannose d) ribose
4. D-xylose is:
a) a four carbon aldose b) has four chiral carbons c) involved in DNA synthesis
d) a keto sugar e) a five carbon aldose
5. All the following are ketoses except:
a) dihydroxyacetone b) ribose c) fructose d) xylulose e) ribulose
6. All of the following are hexose sugars except:
a) Mannose b) Arabinose c) Glucose d) Fructose e) Galactose
7. All of the following sugars are hexoses except:
a) glucose b) fructose c) mannose d) galactose e) ribose
8. Dextrose is:
a) D-glucose b) D-fructose c) dihydroxyacetone d) L-glucose e) L-sucrose
9. About carbohydrates:
a) Dihydroxyacetone and glyceraldehyde have the same functional group
b) D-ribose and D-arabinose are epimers at carbon number 2
c) D-ribose and D-arabinose are enantiomers
d) optical isomers cannot rotate a plane of polarized light
10. How many isomers of sedoheptulose sugar?
a) 2 b) 4 c) 12 d) 10 e) 16
11. Galactose contains:
a) one asymmetric carbon atom b) two asymmetric carbon atoms
c) three asymmetric carbon atoms d) four asymmetric carbon atomsz
12. D-xylulose and D-ribulose are epimers with respect to:
a) C1 b) C2 c) C3 d) C4 e) C5
, .
DR. ZEYAD SAEED |د زياد سعيــــد 2
13. Mannose and galactose are epimers of glucose at carbon number:
a) C2 and C4 respectively b) C2 and C5 respectively c) C3 and C5 respectively
d) C1 and C4 respectively e) C3 and C4 respectively
14. Xylose and lyxose are epimers at carbon:
a) C5 b) C2 c) C3 d) C4 e) not epimers
15.The following is/are epimers of glucose:
a) fructose b) mannose c) ribose d) galactose e) b & d
16. The C2 epimer of glucose is:
a) fructose b) galactose
c) sedoheptulose d) mannose
17. D-arabinose and D-ribose sugars are epimers with respect to:
a) C1 b) C2 c) C3 d) C5 e) C6
18. The D and L isomers of a ribose sugar takes place at:
a) C1 b) C2 c) C3 d) C4 e) C5
19. Alpha and beta configuration of D-fructofuranose depends on the position of:
a) OH group on C1 with OH on C4 b) OH group on C1 with OH on C6
c) OH group on C2 with OH on C5 d) OH group on C2 with OH on C6
e) OH group on C1 with OH on C5
20. The compound on the right is:
a) α-D-glucopyranose b) β-D- glucopyranose c) α-D-galactopyranose
d) β-D- galactopyranose e) none of the above
21. Converting α-D-aldose to a β-D-aldose is called:
a) reduction b) etherification c) mutarotation d) epimerization e) isomerism
22. The anomeric carbon of fructose is at:
a) C1 b) C2 c) C3 d) C4
23. The monosaccharide with no isomerism and asymmetric carbon is:
a) glucose b) fructose c) glyceraldehyde d) dihydroxyacetone e) ribose
24. The following is a type of isomerism found only in the ring structure of monosaccharides and
not in the open chain form:
a) aldose-ketose isomerism b) epimerism c) anomerism d) enantiomerism L & D isomerism
25. How many asymmetric carbons are in ribofuranose?
a) one b) two c) three d) four e) five
26. Fructose contains:
a) 1 asymmetric carbons b) 2 asymmetric carbons c) 3 asymmetric carbons 4) asymmetric carbons
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