A linear polymeric biomolecule with reducing and non-reducing ends is

Options

A. RNA
B. DNA
C. Amylose
D. Protein.

Answer

To solve the question "A linear polymeric biomolecule with reducing and non-reducing ends is", we need to analyze the options provided and understand the characteristics of each biomolecule mentioned.

### Step-by-Step Solution:

1. **Understanding Reducing and Non-Reducing Ends**:
- Reducing sugars have an anomeric carbon with a hydroxyl (OH) group that can participate in redox reactions. This means they can donate electrons and reduce other molecules.
- Non-reducing sugars do not have a free anomeric carbon; thus, they cannot act as reducing agents.

2. **Analyzing the Options**:
- **RNA**: Ribonucleic acid is a linear polymer made up of ribonucleotides. It does not have reducing and non-reducing ends in the same context as sugars.
- **DNA**: Deoxyribonucleic acid is also a linear polymer made of deoxyribonucleotides. Similar to RNA, it does not exhibit reducing and non-reducing ends.
- **Amylose**: This is a linear polysaccharide made up of glucose units linked by alpha-1,4 glycosidic bonds. It has a reducing end (where the free OH group is available) and a non-reducing end (where the glycosidic bond is present).
- **Protein**: Proteins are polymers of amino acids and do not have reducing and non-reducing ends in the context of sugars.

3. **Conclusion**:
- Among the options, only amylose is a linear polymeric biomolecule that has both reducing and non-reducing ends. The reducing end is where the OH group is available, while the non-reducing end is where the glycosidic bond is formed.

### Final Answer:
The correct answer is **amylose**.

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