Substance common in DNA and RNA-

Options

A. Hexose Suger
B. Histamine
C. Thymine
D. Phosphate groups

Answer

To determine the substance that is common in both DNA and RNA, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of DNA and RNA**:
- DNA (Deoxyribonucleic Acid) and RNA (Ribonucleic Acid) are both types of nucleic acids.
- They are composed of repeating units called nucleotides.

2. **Identify Components of Nucleotides**:
- Each nucleotide consists of three components:
- A nitrogenous base (which can be either a purine or a pyrimidine)
- A pentose sugar (ribose in RNA and deoxyribose in DNA)
- A phosphate group

3. **Analyze the Options Provided**:
- The options given are: hexose, sugary, stamine, thymine, and phosphate group.
- Hexose refers to a six-carbon sugar, which is not a component of DNA or RNA.
- "Sugary" is not a specific substance and does not apply.
- "Stamine" seems to be a misspelling or irrelevant term.
- Thymine is a nitrogenous base found in DNA but is replaced by uracil in RNA.
- The phosphate group is a component of both DNA and RNA.

4. **Conclusion**:
- The only substance that is common in both DNA and RNA is the phosphate group.

### Final Answer:
The substance common in DNA and RNA is the **phosphate group**.

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