Where is tRNA formed in a eukaryotic cell- Genetics.?

Answer 1

tRNA is formed in the nucleus, where all RNA is formed.

Eukaryotic cells have 3 main types of RNA:
- mRNA (messanger RNA) - which is transcribed from "standard" genes, and carries the information for protein structure to the cytoplasm for translation into protein.
- rRNA (ribosomal RNA) - which is transcribed in the nucleolus, and forms a large part of the structure of the ribosome (the ribosome is a "ribonucleoprotein, being composed of RNA and protein).
- tRNA (transfer RNA) - which is transcribed from special tRNA genes, and forms the "interface" between mRNA and protein structure, during the process of translation in the ribosome. Each tRNA binds one kind of amino acid, and brings it to the ribosome: one codon on the mRNA binds to one antocodon on the tRNA, and therefore brings the appropriate amino acid to be linked into the elongating protein.

A different RNA polymerase is used to transcribe tRNA genes than is used for mRNA: tRNA uses RNA polymerase III (while mRNA uses RNA polymerase II, and rRNA uses RNA polymerase I)

Answer 2

Transfer RNA (abbreviated tRNA), first hypothesized 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.

Answer 3

Transfer RNA, first hypothesized 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.

Answer 4

tRNA moves around freely in the cytoplasm, bring amino acids to the protein synthesis site.