In the sequence of changes/processes,
`X overset("replication")to Y overset("transcription")to Z overset("translation")to ` proteins X, Y and Z are

Options

A. DNA , DNA and RNA
B. RNA, RNA and DNA
C. DNA , RNA and RNA
D. DNA ,RNA and DNA

Answer

To solve the question regarding the sequence of changes/processes from X to Y to Z and ultimately to proteins, we can break it down step by step.

### Step-by-Step Solution:

1. **Identify the First Process: Replication**
- The first process mentioned is replication. This process involves the duplication of DNA.
- **Conclusion**: X is DNA (the original strand).

2. **Identify the Result of Replication:**
- During replication, one DNA molecule (X) is converted into two identical DNA molecules (Y).
- **Conclusion**: Y is also DNA (the newly synthesized strand).

3. **Identify the Second Process: Transcription**
- The next process is transcription, where a segment of DNA (Y) is copied into RNA.
- **Conclusion**: Z is RNA (the product of transcription).

4. **Identify the Third Process: Translation**
- The final process is translation, where the RNA (Z) is used to synthesize proteins.
- **Conclusion**: The end product of translation is proteins.

### Summary of Findings:
- X = DNA (the original strand)
- Y = DNA (the replicated strand)
- Z = RNA (the transcribed strand)

### Final Answer:
- X, Y, and Z are:
- X = DNA
- Y = DNA
- Z = RNA