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MDCAT
Biology
2011

Biology · Carbohydrates

Work through this past-paper style MCQ, then read the full explanation. Practice more biology questions on mMCQ with adaptive practice and topic analytics.

Question

The bond formed between glucose and fructose form sucrose is:

Options
  • A

    1,4 Glycosidic Linkage

  • B

    1,2 Glycosidic Linkage

  • C

    1,6 Glycosidic Linkage

  • D

    1,3 Glycosidic Linkage

Explanation

In a sucrose molecule, the 1 carbon of glucose is connected to the 2 carbon of fructose, so this bond is called a 1,2 glycosidic linkage.

Option A (1,4 Glycosidic Linkage) is incorrect because sucrose, the disaccharide formed from glucose and fructose, actually contains a 1,2 glycosidic linkage between glucose and fructose. 

In a sucrose molecule, the 1 carbon of glucose is connected to the 2 carbon of fructose, so this bond is called a 1,2 glycosidic linkage. 

Option C (1,6 Glycosidic Linkage) is incorrect because a 1,6 glycosidic linkage typically refers to the type of linkage found in branched polysaccharides like glycogen or amylopectin, not in sucrose. 

Option D (1,3 Glycosidic Linkage) is incorrect because sucrose is formed through a 1,2 glycosidic linkage between the glucose and fructose molecules, not a 1,3 linkage. 

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Tagged under Biology · Carbohydrates · 2011