Starch and cellulose are

Options

A. Branched polysaccharides
B. Storage products
C. Components of plant cell walls
D. Composed of glucose.

Answer

To answer the question "Starch and cellulose are," we need to analyze the characteristics of both starch and cellulose.

### Step-by-Step Solution:

1. **Identify the Composition**:
- Both starch and cellulose are polysaccharides, which means they are large molecules made up of many sugar units (monosaccharides).
- The basic building block of both starch and cellulose is glucose.

2. **Examine Starch**:
- Starch is primarily used as an energy storage product in plants. It is a polymer of glucose units linked together by glycosidic bonds.
- Starch can be classified as a branched polysaccharide, as it consists of amylose (unbranched) and amylopectin (branched).

3. **Examine Cellulose**:
- Cellulose is also a polysaccharide made from glucose units, but it has a different structure compared to starch. It consists of long, straight chains of glucose linked by beta-1,4-glycosidic bonds.
- Cellulose is a major component of the plant cell wall, providing structural support.

4. **Summarize the Key Points**:
- Both starch and cellulose are composed of glucose.
- Starch serves primarily as a storage product in plants.
- Cellulose is a structural component of the plant cell wall.

5. **Choose the Correct Option**:
- Based on the analysis, the correct statement is that starch and cellulose are composed of glucose.

### Final Answer:
Starch and cellulose are composed of glucose.