which one of the following biomolecules is correctly characterized ?

Options

A. Adenylic acid -adensione with a glucose phosphate molecule
B. Alannine amino acid- Contains an amino group and an acidic group anywhere in the molecule
C. Lecithin -a phosphorylated glyceride found in cell membrance.
D. Palmitic acid- an unstaurated fatty acid with 18 carbon atoms

Answer

To solve the question of which biomolecule is correctly characterized, we will analyze each option provided.

### Step-by-Step Solution:

1. **Option 1: Adenylic Acid**
- Adenylic acid, also known as adenosine monophosphate (AMP), is a nucleotide.
- It consists of a phosphate group, a ribose sugar, and the nucleobase adenine.
- The statement mentions "adenosine with a glucose phosphate molecule," which is incorrect because the sugar in adenylic acid is ribose, not glucose.
- **Conclusion:** This statement is incorrect.

2. **Option 2: Alanine**
- Alanine is an alpha-amino acid used in protein biosynthesis.
- It contains an amino group (-NH2) and a carboxylic acid group (-COOH) attached to the central carbon atom, along with a methyl side chain.
- The statement claims that these groups can be found "anywhere in the molecule," which is misleading because they are specifically attached to the central carbon.
- **Conclusion:** This statement is incorrect.

3. **Option 3: Lecithin**
- Lecithin is a type of phospholipid.
- It consists of glycerol, two fatty acids, a phosphate group, and choline.
- Lecithin plays a structural role in cell membranes and is correctly described as a phosphorylated glyceride found in cell membranes.
- **Conclusion:** This statement is correct.

4. **Option 4: Palmitic Acid**
- Palmitic acid is a saturated fatty acid, not an unsaturated one.
- It contains 16 carbon atoms, not 18, and is commonly found in palm oil, meats, and dairy products.
- The statement incorrectly describes palmitic acid as an unsaturated fatty acid.
- **Conclusion:** This statement is incorrect.

### Final Answer:
The biomolecule that is correctly characterized is **Lecithin**.