Some of the molecular found in animal tissue are grouped into three lists.
I. glucose , cholesterol, triglycerides, water
ii. glucose , antibodies, adenine , phospholipids
iii. hemoglobin, carbon dioxide, mRNA , monosaccharides
Which lists include one or more molecules that always contain nitrogen atoms ?

Options

A. I,II and III
B. I and II only
C. I and III only
D. II and III only

Answer

To solve the question, we need to analyze each list of molecules and determine which ones contain nitrogen atoms.

### Step-by-Step Solution:

1. **Analyze List I: Glucose, Cholesterol, Triglycerides, Water**
- **Glucose (C6H12O6)**: Contains carbon, hydrogen, and oxygen, but no nitrogen.
- **Cholesterol**: A lipid molecule that does not contain nitrogen.
- **Triglycerides**: Composed of glycerol and fatty acids, which do not contain nitrogen.
- **Water (H2O)**: Composed of hydrogen and oxygen, with no nitrogen.
- **Conclusion**: **List I does not contain any molecules with nitrogen.**

2. **Analyze List II: Glucose, Antibodies, Adenine, Phospholipids**
- **Glucose**: As established, contains no nitrogen.
- **Antibodies**: Proteins made up of amino acids, which contain nitrogen. **Includes nitrogen.**
- **Adenine**: A nitrogenous base (purine) that contains nitrogen. **Includes nitrogen.**
- **Phospholipids**: Composed of glycerol, fatty acids, and phosphate, but no nitrogen.
- **Conclusion**: **List II contains molecules with nitrogen (Antibodies and Adenine).**

3. **Analyze List III: Hemoglobin, Carbon Dioxide, mRNA, Monosaccharides**
- **Hemoglobin**: A protein that contains amino acids, hence contains nitrogen. **Includes nitrogen.**
- **Carbon Dioxide (CO2)**: Contains carbon and oxygen, but no nitrogen.
- **mRNA**: A type of nucleic acid that contains nitrogenous bases. **Includes nitrogen.**
- **Monosaccharides**: Simple sugars like glucose, which do not contain nitrogen.
- **Conclusion**: **List III contains molecules with nitrogen (Hemoglobin and mRNA).**

### Final Answer:
**Lists II and III include one or more molecules that always contain nitrogen atoms.**