Which happens first: translation or transcription?
1 Answer
Transcription occurs first and is followed by translation
Explanation:
Transcription is the process of synthesis of mRNA with specific sequence of codons as per the sequence of DNA.
mRNA synthesized in the nucleus as per the sequence of codons in DNA. It moves to ribosoms in cytoplasm for the process of translation.
Translation is the synthesis of protein with specific sequence of amino acids. The sequence of amino acids is determined by the sequence of nucleotids in DNA, that constitute gene.
DNA is located in the nucleus and does not move out of it. The synthesis of proteins occurs in ribosoms, which lie in cytoplasm.
DNA synthesizes mRNA with codons sequence complementary to the sequence of codons in DNA. mRNA moves out of the nucleus in the cytoplasm.
mRNA gets attached to smaller sub-unit of ribosom, where the process of translation occurs.
Each amino acid has a specific tRNA . Various amino acids remain floating in cytoplasm attached to their specific tRNA.
tRNA has codon sequence complimentary to codon sequence of mRNA. tRNA helps in bringing amino acids to the site of protein synthesis (ribosome) as per the sequence of codons in mRNA.
Thus the synthesis of protein molecule with specific sequence of amino acids occurs on ribosoms with the help of mRNA and tRNA. This process is called translation.
