The most common cyclic monomer in cellulose is: a. alpha-D-glucose b. beta-D-glu

Question

The most common cyclic monomer in cellulose is: a. alpha-D-glucose b. beta-D-glucose c. alpha-L-glucose d. beta-L-glucose Monosaccharides can be: a. aldoses b. ketoses c. aldoses or ketoses Two monosaccharides are joined by: a. amide bond b. glycosidic bond c. phosphodiester bond d. hydrogen bond The following are reducing sugars except for: a. glucose b. glycogen c. maltose d. sucrose (Benedicts)In the presence of weak alkali (NaCO_3), reducing sugars form __ ? __ which are strong reducing agents. a. enediols b. diols c. alkenes d. ketones A positive test with Benedict's reagent is shown by a color change from a. blue color to a yellow or red precipitate b. red to green or blue coloration c. colorless to black or silver d. yellow to green or blue-green Compounds which give a positive test with Benedict's reagent are: a. monosaccharides b. reducing disaccharides c. both a. and b. d. only aldehydes Which test is used to distinguish between reducing mono- and disaccharides? a. Barfoed's Test b. Benedict's Test c, Molisch's Test d. Selwinoff's Test The following are storage polysaccharides except for: a. cellulose b. dextran c. glycogen d, starch. Monosaccharides in nature mainly occur as: a. D-isomers b. L-isomers c. D- and L-combinations d. E. & Z conformers Acid hydrolysis of complex carbohydrates results in formation of a. amylopectins b. disaccharides c. monosaccharides d. oligosaccharides

Explanation / Answer

1-B( b-D glucose) 2-C (aldoses or ketoses)

3-B(glycosidic bond ) 4-D(sucrose )

5-D( ketones ) 6-A(blue to red ppt )

7-C( bith ) 8-A (Barfoed's test )

9-A( cellulose) 10-A 11_B

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