The structure shown to the right represents the repeating unit of chondriotin su

Question

The structure shown to the right represents the repeating unit of chondriotin sulfate, a glycosaminoglycan found in cartilage. Which of the following is correct concerning this structure? a. B is a #6-sulfate (ester) of a residue of D-N-acetylglucosamine. b. Residue A is in an "alpha glycoside" bond to residue B. c. A is a residue of D-gluconate (conj. base of D-gluconic acid). d. Residue B is a derivative of an L-sugar. e. Residue A is a D-glucuronate residue (pH 7) Sorbose is a very sweet natural sugar that is commercially used for the productionCHrOH of ascorbic acid. The structure of Sorbose is given to the right. Which of the following is not correct concerning Sorbose? a. It is a ketose. b. It is a hexose. c. It will give a positive reducing test with Benedict's reagent. d. It is a D-sugar. e. It is one of eight stereoisomers. In glycoproteins, to which amino acid residues are the sugars attached? a. Tyr, Cys, & Asn b. Ser, Thr, & Tyr c. Asn, Gln, & Asp d. Ser, Thr, Tyr, Asn, & Gin e) Ser, Thr, & Asn Which of the following is correct concerning the structure shown to the right? a. This is Ribonic acid, a sugar acid. b. This compound is produced by oxidation of D-Ribose. c. This is a ketose d. This compound is not soluble in water. c. This is Ribitol, a sugar alcohol.

Explanation / Answer

22. A is a residue of D-gluconate (conjugate base of D-gluconic acid)

23. It will give a positive test with benedict reagent and it is a D-sugar both are not correct because sorbose is a ketose sugar and ketone are not give a positive test with benedict, the given structure is a L-sugar.

24. in glycoprotein the sequence of amino acid resodue is Asn-some other amino acid-Ser or Thr. So the ssequence is Asn,Gla and Asp.

25. This is a ribito (also known as adonitol), it is a sugar alcohol is the correct about the given structure.

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