Which of the following pairs is correctly matched?

Options

A. AIDS virus-reverse transcriptase
B. Oncogenes-ageing
C. Replication fork-mRNA
D. initiation codon-amino acid activation

Answer

To determine which of the following pairs is correctly matched, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding AIDS and its Cause:**
- AIDS stands for Acquired Immunodeficiency Syndrome.
- The virus responsible for AIDS is the Human Immunodeficiency Virus (HIV).
- HIV is classified as a retrovirus, meaning it has RNA as its genetic material.

**Hint:** Remember that AIDS is caused by HIV, which is a retrovirus.

2. **Role of Reverse Transcriptase:**
- Reverse transcriptase is an enzyme that converts RNA into complementary DNA (cDNA).
- This process is known as reverse transcription.
- The cDNA integrates into the host cell's genome and allows the virus to replicate.

**Hint:** Reverse transcriptase is crucial for the replication of retroviruses like HIV.

3. **Analyzing Other Options:**
- **Oncogene and Aging:** Oncogenes are genes that can lead to cancer when mutated or expressed at high levels. They are not related to aging, making this pair incorrect.
- **Replication of Messenger RNA:** According to the central dogma of molecular biology, DNA is transcribed into RNA (not replicated). Replication refers to the duplication of DNA, so this pair is also incorrect.
- **Initiation Codon and Amino Acid Activation:** The initiation codon (AUG) does code for the amino acid methionine and is involved in protein synthesis, but amino acid activation involves tRNA and is not directly matched with the initiation codon. Therefore, this pair is incorrect as well.

4. **Conclusion:**
- After analyzing all the options, the only correctly matched pair is **AIDS, Virus, Reverse Transcriptase**.

### Final Answer:
The correctly matched pair is **AIDS, Virus, Reverse Transcriptase**.