Cellulose, the most important constituent of the plant cell wall, is made up of:
Correct answer: B. Unbranched chain of glucose molecules linked by b1, 4 glycosidic bond
- A. Branched-chain of glucose molecules linked by B-1,4 glycosidic bonds in straight-chain and Alpha1,6 glycosidic bonds at the site of branching
- B. Unbranched chain of glucose molecules linked by b1, 4 glycosidic bond
- C. Branched-chain of glucose molecules linked by Alpha-1,6 glycosidic bonds at the site of branching
- D. Unbranched chain of glucose molecules linked by a1, 4 glycosidic bond
Explanation
Cellulose is the most abundant carbohydrate. Cellulose molecule is composed of 1600 to 6000 glucose molecules joined together. Those polymers form long-twisting macromolecules of cellulose. The chains are unbranched and linear. The successive glucose residues are joined together by B-1,4 linkages.
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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