I am aware that mRNA is sent out of the nucleus into the cytoplasm where it meets with a ribosome and then tRNA comes into the picture to translate. .my question is:
Where did tRNA come from?
Is it something that just freely floats around in the Cytoplasm?
2007-03-23 17:28:01 · 3 answers · asked by III 2 in Science & Mathematics ➔ Biology
from where all rna comes from its transcribed from dna and is usually exported from the nucleus
2007-03-23 18:02:18 · answer #1 · answered by wesnaw1 5 · 2⤊ 0⤋
Transfer RNA (abbreviated tRNA), hypothesised by Francis Crick, is a small RNA chain (73-93 nucleotides) that transfers a specific amino acid to a growing polypeptide chain at the ribosomal site of protein synthesis during translation. It has a 3' terminal site for amino acid attachment, this covalent linkage is catalyzed by an aminoacyl tRNA synthetase. It also contains a three base region called the anticodon that can base pair to the corresponding three base codon region on mRNA. Each type of tRNA molecule can be attached to only one type of amino acid, but because the genetic code contains multiple codons that specify the same amino acid, tRNA molecules bearing different anticodons may also carry the same amino acid.
And so, to answer your question, these structures are just simply produced within the genetically-coded cell.
2007-03-23 17:34:50 · answer #2 · answered by Anonymous · 1⤊ 2⤋
is it a broken strand of RNA? and where do its nucleotides come from?
2015-04-03 09:48:52 · answer #3 · answered by Vash 1 · 0⤊ 1⤋