Question

Choose the linkage in cellulose
• $\beta(1\rightarrow6)$
• $\beta(1\rightarrow4)$
• $\alpha(1\rightarrow4)$
• $\alpha(1\rightarrow6)$

• A. β(1-6)
• B. β(1-4)
• C. α(1-4)
• D. α(1-6)

Hint:

Cellulose: \[ \beta(1\rightarrow4) \] Starch: \[ \alpha(1\rightarrow4) \]

Answer 1

The Correct Option is B

Concept: Cellulose is a structural polysaccharide present in plant cell walls. It is formed by repeated joining of: \[ \boxed{ \beta\text{-D-glucose units} } \] The glucose molecules are connected through: \[ \boxed{ \beta(1\rightarrow4)\ \text{glycosidic linkage} } \]

Step 1: Understand the structure of cellulose. Cellulose consists of:
• Long straight chains of glucose molecules
• Strong hydrogen bonding between chains This gives:
• Mechanical strength to plants

Step 2: Understand glycosidic linkage. A glycosidic bond forms when:
• Two monosaccharides join by removal of water molecule. In cellulose:
• Carbon-1 of one glucose joins Carbon-4 of next glucose. Thus linkage is: \[ \boxed{ \beta(1\rightarrow4) } \]

Step 3: Why other options are incorrect.
• $\alpha(1\rightarrow4)$ linkage is found in starch.
• $\alpha(1\rightarrow6)$ linkage occurs in branching points of glycogen.
• $\beta(1\rightarrow6)$ is not characteristic linkage of cellulose.

Step 4: Choose correct answer. Therefore: \[ \boxed{ \beta(1\rightarrow4) } \] Hence correct option is: \[ \boxed{(2)} \] Final Conclusion: Cellulose contains: \[ \boxed{ \beta(1\rightarrow4)\ \text{glycosidic linkage} } \] Hence correct answer is: \[ \boxed{(2)} \]