Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

(1) As t-RNA can read the codon and also can bind with the amino acid, t-RNA is considered as an adapter molecule.
(2) Clover leaf structure (2 dimensional) of t-RNA:

• t-RNA has four arms – DHU arm (has amino acyl binding loop), middle arm (has anticodon loop), Tif/C arm (has ribosome binding loop) and variable arm.
• It has G nucleotide at 5’ end.
• Amino acid acceptor end (3’ end) having unpaired CCA bases (i.e. amino acid binding site).

(3) For every amino acid, there is specific t-RNA.
(4) Initiator t-RNA is specific for methionine.
(5) There are no t-RNAs for stop codons.
(6) In the actual structure, the t-RNA molecule looks like inverted L (3 dimensional : structure)