Read the following analogies and state the one which is wrong.

Options

A. Starch : bluish black colour with iodine :: Glycogen : Red colour with iodine
B. DNA : 4 types of monomers :: Protein : 20 types of monomers
C. Oleic acid : MUFA :: Palmitic acid : PUFA
D. Phospholipid : Lecithin :: Glycolipid : Ganglioside

Answer

To solve the question of identifying the incorrect analogy among the given statements, we will analyze each analogy step by step.

### Step 1: Analyze the First Statement
- **Statement**: Starch gives a bluish-black color with iodine, while glycogen gives a reddish color with iodine.
- **Analysis**: This statement is correct. Starch indeed gives a bluish-black color when tested with iodine, while glycogen gives a reddish-brown color.

### Step 2: Analyze the Second Statement
- **Statement**: DNA is made up of four types of monomers.
- **Analysis**: This statement is correct. DNA is composed of four nucleotide monomers: adenine (A), thymine (T), cytosine (C), and guanine (G).

### Step 3: Analyze the Third Statement
- **Statement**: Proteins are made up of 20 types of monomers.
- **Analysis**: This statement is correct. Proteins are composed of 20 different amino acids, which serve as the monomers for protein synthesis.

### Step 4: Analyze the Fourth Statement
- **Statement**: Oleic acid is a monounsaturated fatty acid, while palmitic acid is a polyunsaturated fatty acid.
- **Analysis**: This statement is incorrect. Oleic acid is indeed a monounsaturated fatty acid, but palmitic acid is a saturated fatty acid, not polyunsaturated.

### Step 5: Analyze the Fifth Statement
- **Statement**: Lecithin is a phospholipid, while ganglioside is a glycolipid.
- **Analysis**: This statement is correct. Lecithin is a type of phospholipid, and gangliosides are indeed glycolipids.

### Conclusion
After analyzing all the statements, the incorrect analogy is:
- **Oleic acid is a monounsaturated fatty acid, while palmitic acid is a polyunsaturated fatty acid.** This is the wrong statement.