Biology Biomolecules DUHS 2022
PMDC Verified Question 87 of 142
Molecules of amylose consists of unbranched chains of hundreds of glucose sub units, join together by:
A
1-3 glycosidic linkage
B
1-2 glycosidic linkage
C
1-4 glycosidic linkage
D
2-3 glycosidic linkage
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 1-4 glycosidic linkage
Concept:

Starch comes in two forms: unbranched amylose and highly branched amylopectin.

Solution:

  • Amylose is the simple, unbranched, linear component of starch.


  • It forms a helical chain because its glucose units are linked strictly end-to-end via α-1,4-glycosidic linkages (Carbon 1 of one glucose binding to Carbon 4 of the next).


Why other options are incorrect:

  • Branching in amylopectin/glycogen occurs at 1-6 linkages. The other listed linkages (1-2, 1-3, 2-3) do not form the standard backbone of plant starch.

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