Energy for activation of amino acids during proteins synthesis comes from

Options

A. ATP
B. GTP
C. CTP
D. UTP

Answer

To solve the question regarding the source of energy for the activation of amino acids during protein synthesis, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Protein Synthesis**:
- Protein synthesis involves the translation of mRNA into a polypeptide chain, which is formed by amino acids linked together.

2. **Activation of Amino Acids**:
- Before amino acids can be added to the growing polypeptide chain, they must be activated. This activation is crucial for the subsequent steps in protein synthesis.

3. **Role of Aminoacyl-tRNA Synthetase (AARS)**:
- The activation of amino acids is catalyzed by enzymes known as aminoacyl-tRNA synthetases (AARS). These enzymes facilitate the attachment of amino acids to their corresponding tRNA molecules.

4. **Formation of Aminoacyl Adenylate Complex**:
- During the activation process, the amino acid reacts with ATP to form an enzyme-aminoacyl adenylate complex. This complex is essential for the next step in protein synthesis.

5. **Energy Source**:
- The energy required for the activation of amino acids comes from the hydrolysis of ATP. Specifically, ATP is converted to AMP (adenosine monophosphate) and pyrophosphate (PPi) through the removal of two inorganic phosphates.

6. **Final Answer**:
- Therefore, the energy for the activation of amino acids during protein synthesis comes from ATP.