Question

What is true about t-RNA?
A. It has five double stranded regions.
B. It binds with an amino acid at its 3' end.
C. It looks like a clover leaf in the three-dimensional structure.
D. It has a codon at one end which recognizes the anticodon on messenger RNA.

Answer 1

Hint:-t-RNA or the transfer RNA is the connecting link between m-RNA and protein synthesis. It carries the amino acids which are used in the process of translation. They pair up with m-RNA in a complementary and antiparallel manner.

Complete step-by-step solution:-
The t-RNA attaches itself to a site present in the ribosomes which are attached to the m-RNA. The t-RNA has a clover leaf structure in the two-dimensional structure and when viewed in the three dimension, the structure occurs as the ‘L’ shaped in which the anticodon and the acceptor stem form a double helix with each other. The t-RNA is composed of a D-loop, variable loop, anticodon loop, variable loop and a T psi C loop. The anticodon loop consists of the bases which are complementary to the codons present on the m-RNA. It also determines which amino acid is attached to the acceptor stem. They have four base paired stems and consist of three loops. So, it has only four double stranded regions. The amino acid binding takes place at the 3’ end of the t-RNA. This end always ends with the CCA- bases present. This is part of the acceptor arm of the molecule.
So, the answer is Option B.

Note:- The t-RNA molecule has a clover leaf structure in two-dimensional form and ‘L’ shaped form in the three-dimensional form. It doesn’t have five double stranded regions but has only four double stranded regions present. The t-RNA has an anticodon region and a coding region present in the messenger RNA.