Which of the following is one of the sweetest protein obtained from African berry plant ?

Options

A. Monellin
B. Resilin
C. Collagen
D. GLUT-4

Answer

To answer the question, "Which of the following is one of the sweetest proteins obtained from the African berry plant?" we will analyze the options provided:

1. **Identify the options**: The options given are Monilin, Rasaline, Collagen, and Glutathione.

2. **Research the African berry plant**: The sweetest protein obtained from the African berry plant is known as Monilin. The scientific name of the African berry plant is *Dioscoreophyllum cumminsii*.

3. **Analyze Monilin**: Monilin is recognized as the sweetest protein discovered to date. It consists of two chains of amino acids:
- Chain A contains 44 amino acid residues.
- Chain B contains 50 amino acid residues.
- In total, Monilin is made up of 94 amino acid residues.

4. **Evaluate the other options**:
- **Rasaline**: This protein is not related to sweetness; it is found in insects and provides mechanical support and elasticity to their tissues.
- **Collagen**: This is a structural protein found in the extracellular matrix and connective tissues of mammals, not known for sweetness.
- **Glutathione**: This is a transport protein involved in glucose transport and is not sweet.

5. **Conclusion**: Based on the information analyzed, the correct answer is **Monilin**, as it is the sweetest protein obtained from the African berry plant.

### Final Answer:
**Monilin** is the sweetest protein obtained from the African berry plant.