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 determine which analogy is wrong, we will analyze each statement one by one based on the information provided in the video transcript.

### Step-by-Step Solution:

1. **Analyzing Starch and Iodine:**
- Starch is tested using iodine, which turns blue or black in the presence of starch.
- **Conclusion:** This statement is correct.

2. **Analyzing Glycogen and Iodine:**
- Glycogen is also tested with iodine, and it turns red when glycogen is present.
- **Conclusion:** This statement is correct.

3. **Analyzing DNA:**
- DNA is composed of four types of monomers: adenine, guanine, cytosine, and thymine.
- **Conclusion:** This statement is correct.

4. **Analyzing Proteins:**
- Proteins are made up of 20 different amino acids (monomers).
- **Conclusion:** This statement is correct.

5. **Analyzing Oleic Acid and MUFA:**
- Oleic acid is classified as a Monounsaturated Fatty Acid (MUFA), which contains one double bond.
- The transcript incorrectly states that palmitic acid is an example of MUFA, when in fact, palmitic acid is a saturated fatty acid.
- **Conclusion:** This statement is incorrect.

6. **Analyzing Lecithin and Glycolipids:**
- Lecithin is a phospholipid found in cell membranes, and glycolipids like gangliosides also play a role in cell membrane structure.
- **Conclusion:** This statement is correct.

### Final Conclusion:
The analogy that is wrong is the one regarding oleic acid being classified as MUFA and incorrectly associating palmitic acid with it. Therefore, the third option is incorrect.