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  • Three structures are given below in which two glucose units are linked.

Three structures are given below in which two glucose units are linked. Which of these linkages between glucose, units are between C_1 andC_4 and which linkages are between C_1 and C_6?

(i) (A) is between C_1 andC_4 , (B) and (C) is between C_1 and C_6

(ii) (A) and (B) are between C_1 andC_4 , (C) is between C_1 and C_6

(iii) (A) and (C) is between C_1 andC_4 , (B) is between C_1 and C_6

(iv) (A) and (C) is between C_1 and C_6, (B) is between C_1 andC_4

Answers (1)

The correct option is option (iii) because the numbering, in the case of glucose, starts from the -O atom and ends at the last CH_2OH. This means that (iii) (A) and (C) is between C_1 andC_4, (B) is between C_1 and C_6 is the right answer.

A C1-C4 linkage is an alpha-1,4-glycosidic bond that forms between the anomeric carbon (carbon 1) and carbon 4 of two connected sugar molecules. This type of linkage is crucial for the synthesis of carbohydrates. 

Here are some examples of molecules that contain C1-C4 linkages:

  • Glycogen: A branched-chain polymer of alpha-D glucose units that forms chains through C1-C4 glycosidic linkages and branches through C1-C6 glycosidic linkages 
  • Starch: Made up of monomers linked together by alpha(1-4) glycosidic bonds 
  • Maltose: Made up of two glucose molecules linked together by a -1,4-glycosidic bond 
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