Biogenetic amines are

Options

A. Tryoptophan
B. Tyrosine
C. Glutamic acid
D. Phenylalanine.

Answer

### Step-by-Step Solution:

1. **Understanding Biogenetic Amines**:
- Biogenetic amines are organic compounds that contain an amine group (-NH2). They are significant in biological systems and play various roles, including acting as neurotransmitters.

2. **Formation of Biogenetic Amines**:
- These amines are formed through a process called deamination, where an amino group is removed from an amino acid. This process transforms the amino acid into an amine.

3. **Identifying the Amino Acids**:
- The question lists four amino acids: tryptophan, tyrosine, glutamic acid, and phenylalanine. We need to determine which of these can be classified as a biogenetic amine.

4. **Analyzing Each Amino Acid**:
- **Tryptophan**: Precursor for serotonin, but not a biogenetic amine itself.
- **Tyrosine**: Precursor for several important biogenetic amines, including dopamine, norepinephrine, and epinephrine.
- **Glutamic Acid**: Functions as a neurotransmitter but is not classified as a biogenetic amine.
- **Phenylalanine**: Precursor to tyrosine but not a biogenetic amine itself.

5. **Conclusion**:
- Among the listed options, tyrosine is the amino acid that directly leads to the formation of biogenetic amines, making it the correct answer.

### Final Answer:
**Tyrosine** is the correct answer as it is the amino acid from which biogenetic amines are derived.