The overall role of tRNA in protein synthesis is to decode a specific codon of mRNA, using its anticodon, in order to transfer a specific amino acid to the end of a chain in the ribosome. Many tRNAs together build upon the amino acid chain, eventually creating a protein for the original mRNA strand.
What are the 3 binding sites for tRNA?
Three tRNA-binding sites are located on the ribosome, termed the A, P and E sites.
What is true tRNA?
All tRNAs have about 73 to 93 nucleotides that fold into four base-paired stems and three loops, a structure which looks like a clover leaf in two dimension and. it is “L” shaped in three-dimensional structure. The 3′ end has CCA sequence. Transfer-RNA has 7-15% post-transcriptionally modified bases.
What is false tRNA?
The amino acid are attached to the cytosine-cytosine-adenine sequence at the 3′ end of the tRNA molecule The enzyme aminoacyl-tRNA synthetases to form aminoacyl-tRNA is covalently bonded to the 3′-hydroxyl group on the CCA tail. So, the correct answer is option A. Answer verified by Toppr.
Does tRNA contain thymine?
tRNA doesn’t have Thymine, its the DNA group that has thymine. For the RNA group it has Uracil in its place. As for the function of these, they are just different bits of the genetic code.
Which is incorrect for tRNA?
The D loop serves as aminoacyl synthetase recognition and binding loop while the T psi C loop binds the charged tRNA-amino acid to ribosome. The anticodon loop has triplet at the tip which base pairs with the corresponding codon in mRNA; statement C is wrong. Thus, the correct answer is option A.
Where are tRNA made?
In eukaryotes, the mature tRNA is generated in the nucleus, and then exported to the cytoplasm for charging. Processing of a pre-tRNA.: A typical pre-tRNA undergoing processing steps to generate a mature tRNA ready to have its cognate amino acid attached. Nucleotides that are cleaved away are shown in green.
What produces tRNA?
In eukaryotic cells, tRNA are made by a special protein that reads the DNA code and makes an RNA copy, or pre-tRNA. This process is called transcription and for making tRNA, it’s done by RNA polymerase III. Pre-tRNA are processed once they leave the nucleus.
What enzyme synthesizes tRNA?
RNA polymerase
Who discovered tRNA?
Paul Zamecnik