What is the difference between DNA replication and transcription?

• A. Both processes occur in the cytoplasm.
• B. Replication produces RNA, while transcription produces DNA.
• C. Replication copies the entire genome, while transcription synthesizes RNA from specific sequences.
• D. Transcription occurs in the nucleus, while replication occurs in the mitochondria.

Answer: (C)

In the context of DNA replication and transcription, the fundamental distinction lies in their purposes and outcomes. DNA replication is a process that duplicates the entire genome, ensuring that each daughter cell receives an identical copy of the DNA during cell division. This includes all the sequences of nucleotides present in the DNA.

On the other hand, transcription is the process by which specific segments of DNA are copied into RNA. This usually involves coding regions known as genes, which are transcribed to produce messenger RNA (mRNA). The end result is that only a subset of the DNA is transcribed depending on the needs of the cell, and this selectivity allows for the expression of different genes at different times, facilitating various cellular functions.

Therefore, while replication aims for a comprehensive copy of the whole genetic material, transcription is selective and focused on generating RNA from particular gene sequences. This key difference underscores the correct answer, which highlights that DNA replication entails copying the entire genome, unlike transcription’s more targeted approach.