Clover leaf secondary structure of $tRNA$ has a loop for
three nucleotides of a codon.
three nucleotides of an anticodon.
no nucleotides.
both $(a)$ and $(b)$
In tryptophan operon
In a mutational event, when adenine is replaced by guanine, it is a case of
$TATA$ box of eukaryotic promotor lies
Process of reverse transcription was discovered by Temin in
Hereditary element may be attached to chromosome or found free in cytoplasm is called