Question

Amino acid binding site of tRNA has
A. CCA -OH
B. CGA-OH
C. UCA-OH
D. UCG – OH

Answer 1

Hint:-tRNA is also called transfer RNA, which is also referred to as sRNA or soluble RNA, and
this is an adaptor molecule, which is composed of RNA, and it consists of almost 70 to 90 nucleotide
base pairs in length this tRNA, serves as a link between mRNA and amino acid sequence of proteins.

Complete step-by-step solution:-
1. When coming to the structure of tRNA, it is composed of 3types of structures, such as primary,
secondary, and tertiary structures.
2. This tRNA is a cloverleaf structure that becomes a 3D L shaped structure through coaxial
stacking of helices.
3. The length of each arm of the tRNA and its loop diameter generally vary from species to species.
4. The structure of tRNA consists of the following things, such as.
5’ terminal phosphate group.
Acceptor stem: It is the stem that is made up of 7 to 9 base pairs, of 5’ terminal nucleotide with
3’ terminal nucleotide, and these 3’ terminal nucleotides are referred to as genomic tags, and
This accepted stem contains non Watson Crick base pairs.
The CCA tail: it is the cytosine-cytosine-adenine sequence at the 3’ end of the tRNA molecule
and it is the end where the amino acids are added tRNA molecule with the help of some
enzymes, where they are bonded covalently to the 3’ end where it has a hydroxyl group at CCA
tail, where those added amino acids are very important for translation.
D arm: It is a 4 to 6 base pairs stem, and it's loop ending contains dihydrouridine.
Anticodon arm: It contains the 5 base pairs stem, where the loop of this system contains the
anticodons.
T arm: It is the stem of 4 to 5 base pairs and it contains T and C along with uridine or
pseudouridine.
So the correct option is A.

Note:- tRNA is the important structure which to make the peptide chains by adding the amino acids and this structure is a cloverleaf shape and it consists of different arms, and among those the amino acids are generally loaded to the CCA tail of the tRNA.