What is the difference between DNA and mRNA?

Answer 1

All human cells (with the exception of RBCs) contain DNA as a guide to how that cell functions. Depending on the cell, certain parts of that DNA is active to provide individual information to each cell on what proteins are required for functioning. In order to get the information out into the cell from the DNA in the nucleus, the cell uses a number of proteins to complete DNA transcription to create mRNA. After some processing in the nucleus, the mRNA is ready to go into the cell and attach to ribosomes, generally in the RER, to be translated into proteins for cellular functioning or are sent out into the blood stream for widespread communication and functioning of the organism, such as hormones.