DNA and RNA comprise of

Options

A. Sugar, phosphate, base
B. Sugar, phosphate
C. Base, phosphate
D. Sugar, base.

Answer

**Step-by-Step Solution:**

1. **Understanding the Components of DNA and RNA:**
- DNA (Deoxyribonucleic Acid) and RNA (Ribonucleic Acid) are both types of nucleic acids found in living organisms.
- They are polymers made up of smaller units called nucleotides.

2. **Defining Nucleotides:**
- A nucleotide consists of three components:
- A nitrogenous base
- A pentose sugar
- A phosphate group

3. **Identifying the Types of Sugars:**
- The sugar in DNA is deoxyribose.
- The sugar in RNA is ribose.
- Both sugars are pentose sugars, meaning they have five carbon atoms.

4. **Identifying the Nitrogenous Bases:**
- There are two types of nitrogenous bases:
- Purines (adenine and guanine)
- Pyrimidines (cytosine, thymine in DNA, and uracil in RNA)

5. **Conclusion:**
- Therefore, both DNA and RNA comprise a combination of:
- Sugar (deoxyribose in DNA and ribose in RNA)
- Phosphate group
- Nitrogenous base
- The correct answer to the question is: **sugar, phosphate, base.**

**Final Answer:**
DNA and RNA comprise of sugar, phosphate, and base.

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