If the molecular mass of an amino acid is 150 daltoms, the molecular mass of a tripeptide will be

Options

A. 450
B. 486
C. 504
D. 414

Explanation

To find the molecular mass of a tripeptide when the molecular mass of an amino acid is given as 150 Daltons, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Composition of a Tripeptide**:
- A tripeptide is made up of three amino acids linked together by peptide bonds.

2. **Calculate the Total Mass of Amino Acids**:
- Since each amino acid has a molecular mass of 150 Daltons, the total mass of three amino acids can be calculated as:
\[ \text{Total mass of amino acids} = 3 \times 150 \text{ Daltons} = 450 \text{ Daltons} \]

3. **Account for Water Molecules Released**:
- When amino acids form peptide bonds, water molecules are released. For a tripeptide, two peptide bonds are formed (one between each pair of amino acids), resulting in the release of two water molecules.
- The molecular mass of water is approximately 18 Daltons. Therefore, the total mass of the water released is:
\[ \text{Mass of water released} = 2 \times 18 \text{ Daltons} = 36 \text{ Daltons} \]

4. **Calculate the Molecular Mass of the Tripeptide**:
- To find the molecular mass of the tripeptide, subtract the mass of the water released from the total mass of the amino acids:
\[ \text{Molecular mass of tripeptide} = \text{Total mass of amino acids} - \text{Mass of water released} \]
\[ \text{Molecular mass of tripeptide} = 450 \text{ Daltons} - 36 \text{ Daltons} = 414 \text{ Daltons} \]

5. **Final Answer**:
- The molecular mass of the tripeptide is **414 Daltons**.