RNA can acts as
a. Genetic material b. Messenger
c. Adapter molecule d. Structural molecule
e. Catalytic molecule

Options

A. b, c and e
B. a, d and e
C. a, b and c
D. a, b, c, d and e

Explanation

To solve the question regarding the roles of RNA, we will analyze each option provided:

1. **Genetic Material**:
- RNA can serve as genetic material in some viruses, such as retroviruses like HIV. In these cases, RNA carries the genetic information necessary for the virus to replicate and infect host cells.
- **Hint**: Consider which organisms or entities primarily use RNA for genetic information.

2. **Messenger**:
- RNA is known as messenger RNA (mRNA), which is a type of RNA that conveys genetic information from DNA to the ribosome, where proteins are synthesized. This role is crucial in the process of gene expression.
- **Hint**: Think about the process of protein synthesis and the role of RNA in transferring information from DNA.

3. **Adapter Molecule**:
- Transfer RNA (tRNA) acts as an adapter molecule during protein synthesis. It helps in translating the genetic code into a sequence of amino acids by bringing the appropriate amino acids to the ribosome.
- **Hint**: Recall the role of tRNA in connecting codons on mRNA to the corresponding amino acids.

4. **Structural Molecule**:
- RNA can also play a structural role, as seen in ribosomal RNA (rRNA), which is a key component of ribosomes, the cellular machinery that synthesizes proteins.
- **Hint**: Consider the components of ribosomes and how RNA contributes to their structure.

5. **Catalytic Molecule**:
- Some RNA molecules, known as ribozymes, have catalytic properties and can facilitate biochemical reactions, similar to enzymes.
- **Hint**: Think about RNA's ability to catalyze reactions, which is a unique feature compared to DNA.

**Conclusion**:
Based on the analysis, RNA can act as:
- Genetic material (in some viruses)
- Messenger (mRNA)
- Adapter molecule (tRNA)
- Structural molecule (rRNA)
- Catalytic molecule (ribozymes)

Thus, all options (a, b, c, d, e) are correct, making the answer **all of the above**.

**Final Answer**: RNA can act as genetic material, messenger, adapter molecule, structural molecule, and catalytic molecule.