Animals do not synthesis
(a) Protein
(b) Vitamins
(c) Glycogen
(d) Phospholipids

Options

A. Protien
B. Vitamins
C. Glycogen
D. Phospholipids

Answer

To solve the question "Animals do not synthesize," we will analyze each option provided:

### Step-by-Step Solution:

1. **Analyze Option A: Protein**
- Animals can synthesize proteins. They do this by using amino acids, which are the building blocks of proteins. The body can produce some amino acids (non-essential amino acids), while others must be obtained from the diet (essential amino acids). Therefore, animals do synthesize proteins.
- **Conclusion**: Option A is incorrect.

2. **Analyze Option B: Vitamins**
- Most vitamins cannot be synthesized by animals and must be obtained from their diet. While there are a few exceptions where certain vitamins can be synthesized in small amounts (like Vitamin D in the skin), the majority of vitamins are essential nutrients that animals need to consume. Thus, animals do not synthesize most vitamins.
- **Conclusion**: Option B is correct.

3. **Analyze Option C: Glycogen**
- Glycogen is a polysaccharide that serves as a form of energy storage in animals. It is synthesized from glucose molecules primarily in the liver and muscles. Therefore, animals do synthesize glycogen.
- **Conclusion**: Option C is incorrect.

4. **Analyze Option D: Phospholipids**
- Phospholipids are essential components of cell membranes and are continuously synthesized in the body. They are made from fatty acids and glycerol, and thus, animals do synthesize phospholipids.
- **Conclusion**: Option D is incorrect.

### Final Answer:
The correct answer is **(b) Vitamins**. Animals do not synthesize most vitamins and must obtain them from their diet.

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