In amylose units are linked by.

Options

A. `alpha-1-4` linkages
B. `alpha - 1-6` linkage
C. both `alpha` -1-4 and `alpha`,1-4 linkage
D. all of the above

Answer

To answer the question "In amylose, units are linked by," we need to understand the structure of amylose and how its glucose units are connected. Here’s a step-by-step solution:

### Step 1: Understand the Composition of Amylose
Amylose is a polysaccharide that is a component of starch. It is primarily composed of glucose units.

**Hint:** Remember that amylose is a polymer made up of repeating glucose units.

### Step 2: Identify the Type of Linkage
The glucose units in amylose are connected by glycosidic bonds. Specifically, the type of glycosidic bond that links these units is crucial for understanding its structure.

**Hint:** Glycosidic bonds can vary; focus on the specific type used in amylose.

### Step 3: Determine the Specific Linkage
In amylose, the glucose units are linked by alpha 1,4 glycosidic linkages. This means that the first carbon (C1) of one glucose molecule is linked to the fourth carbon (C4) of the next glucose molecule in an alpha configuration.

**Hint:** Look for the specific carbon positions in the glucose structure that form the linkage.

### Step 4: Conclusion
Based on the information gathered, the correct answer to the question is that in amylose, the units are linked by **alpha 1,4 linkage**.

**Final Answer:** Option A: alpha 1,4 linkage.