Final answer:
mRNA is the product of transcription and serves as the starting material for translation, where it is read by ribosomes to synthesize proteins.
Step-by-step explanation:
The product of transcription and the starting material of translation is mRNA or messenger RNA. During the process of transcription, a single strand of mRNA is synthesized as a transcript of DNA. Subsequently, during translation, the mRNA is utilized by the ribosomes as a template to synthesize proteins. The mRNA template, along with ribosomes and tRNA molecules, directs the assembly of amino acids into a polypeptide chain which will eventually fold into a functional protein. Each set of three bases on the mRNA, known as a codon, corresponds to a single amino acid, and the tRNA molecules carry these amino acids to the ribosome where they are added to the growing protein chain.