9. All of the following disaccharides are reducing sugars EXCEPT: (A) lactose. (B) maltose. (C) sucrose. (D) cellulose. (E) isomaltose.

6. Planarity of the peptide bond means that rotation is allowed about the bond linking ___________the and the carbon of the peptide bond, and also about the bond linking the___________ to the adjacent α-carbon. (A) a-carbon, carbony1 carbon (B) B-carbon, carbonyl carbon (C) carbonyl carbon, nitrogen of the peptide bond (D) a-carbon, nitrogen of the peptide bond (E) none are true

9. All of the following disaccharides are reducing sugars EXCEPT:
(A) lactose.
(B) maltose.
(C) sucrose.
(D) cellulose.
(E) isomaltose.

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