* Transcription is the process of creating a messenger RNA (mRNA) copy of a gene from DNA. This mRNA molecule then carries the genetic information from the DNA in the nucleus to the ribosomes in the cytoplasm.
* Organelles like mitochondria and chloroplasts have their own DNA. They don't rely on DNA from the nucleus for their primary functions. They have their own separate genomes.
* The mRNA molecule is the one that brings the message to the ribosomes. Ribosomes are the cellular machinery responsible for translating the mRNA's genetic code into proteins.
So, the flow of information during transcription is:
1. DNA in the nucleus: Contains the genetic code.
2. Transcription: A copy of the gene is made in the form of mRNA.
3. mRNA travels to the ribosomes: Ribosomes are found in the cytoplasm.
4. Translation: The mRNA's code is used by ribosomes to build proteins.
Think of it like this: DNA is like a blueprint in the architect's office (nucleus). The mRNA is a copy of that blueprint taken to the construction site (cytoplasm) where the workers (ribosomes) build the actual structure (proteins).
While mitochondria and chloroplasts have their own DNA, they also use mRNA for protein synthesis. Their mRNA molecules are typically transcribed from their own DNA.
Let me know if you have any further questions!
