A compound which contains both ……….. And …………..is called amino acid. The amino acids in polypeptide chain are joined by …………bonds.

Options

A. amino, carboxylic , group , ester
B. amino, carboxylic group, peptide.
C. nitrogen , carbon , glycosidic
D. hydroxy, carboxylic group, peptide.

Answer

**Step-by-Step Solution:**

1. **Identify the Components of an Amino Acid:**
An amino acid is a compound that contains two functional groups: an amine group and a carboxylic acid group. The amine group is represented as -NH2, and the carboxylic acid group is represented as -COOH.

2. **Structure of an Amino Acid:**
The general structure of an amino acid can be represented as NH2-CHR-COOH, where R represents a side chain that varies among different amino acids. This structure indicates that each amino acid has both an amine group and a carboxylic acid group.

3. **Formation of Peptide Bonds:**
When amino acids link together to form a polypeptide chain, they do so through a process called condensation. During this process, a water molecule is released, and a bond is formed between the amine group of one amino acid and the carboxylic acid group of another.

4. **Identify the Type of Bond Formed:**
The bond that is formed between the amino acids is known as a peptide bond. This bond is specifically a covalent bond that links the carbon atom of the carboxylic acid group of one amino acid to the nitrogen atom of the amine group of another amino acid.

5. **Final Answer:**
Therefore, the complete statement is:
"A compound which contains both an amine group and a carboxylic acid group is called an amino acid. The amino acids in a polypeptide chain are joined by peptide bonds."