Question

In amylopectin, branching occurs by which of the glycosidic linkage?

• A. C–2 to C–6
• B. C–3 to C–6
• C. C–2 to C–3
• D. C–1 to C–6

Hint:

In amylopectin, branching happens via $\alpha$-1,6-linkages, while the main chain consists of $\alpha$-1,4-linkages.

Answer 1

The Correct Option is D

Amylopectin is a branched polysaccharide component of starch. It consists of glucose units connected predominantly by $\alpha$-1,4-glycosidic bonds, with branch points formed by $\alpha$-1,6-glycosidic bonds. The branching specifically occurs when the C–1 carbon of one glucose unit forms a glycosidic bond with the C–6 carbon of another glucose unit.

Answer 2

In amylopectin, branching occurs by which of the glycosidic linkage?

Step 1: Understand the structure of amylopectin:
Amylopectin is a complex carbohydrate and a branched polysaccharide component of starch. It is made up of glucose units connected in both linear and branched patterns.

Step 2: Identify the types of glycosidic bonds in amylopectin:
- The linear chains of glucose units are connected by α(1→4) glycosidic bonds. These occur between the carbon-1 of one glucose molecule and the carbon-4 of the next.
- The branches in amylopectin are formed by α(1→6) glycosidic bonds. These occur when the carbon-1 of a glucose unit connects to the carbon-6 of another glucose unit, creating a branch point.

Step 3: Importance of branching:
Branching in amylopectin increases its solubility and provides multiple ends for enzymatic attack during digestion. This allows for quicker energy release when the body breaks down starch.

Therefore, the glycosidic linkage responsible for branching in amylopectin is:
\[ \boxed{C–1 \text{ to } C–6} \]