How many peptide linkage are present in the following
`NH_2-CH_2-oversetoverset(O)(||)C-NH-oversetoverset(CH_3)(|)CH-oversetoverset(O)(||)C-NH-CH_2-CH_2-oversetoverset(O)(||)C-NH-oversetoverset(CH_3)(|)(CH)-CH_2-oversetoverset(O)(||) ( C)-NH-CH_2-COOH`

Explanation

To determine the number of peptide linkages in the given structure, we need to follow these steps:

### Step 1: Identify the Structure
The given structure is a complex molecule that consists of several amino acid units. Each amino acid unit typically contains an amino group (-NH2), a carboxyl group (-COOH), and a side chain (R group).

### Step 2: Understand Peptide Linkages
A peptide linkage (or amide bond) is formed between the carboxyl group of one amino acid and the amino group of another amino acid. This reaction releases a molecule of water (condensation reaction).

### Step 3: Count the Amino Acids
To find the number of peptide linkages, we first need to identify how many amino acids are present in the structure. Each amino acid contributes one peptide bond when it connects to another amino acid.

### Step 4: Analyze the Given Structure
In the provided structure, we can identify the following segments:
1. The first amino acid unit (NH2-CH2-CO-)
2. The second amino acid unit (NH-CH(CH3)-CO-)
3. The third amino acid unit (NH-CH2-CH2-CO-)
4. The fourth amino acid unit (NH-CH(CH3)-CH2-CO-)
5. The fifth amino acid unit (NH-CH2-COOH)

### Step 5: Count the Peptide Linkages
For 'n' amino acids, the number of peptide linkages formed is (n - 1). In this case, we have identified 5 amino acid units:
- Therefore, the number of peptide linkages = 5 - 1 = 4.

### Final Answer
The total number of peptide linkages present in the molecule is **4**.

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