When abundant tryptophan is present in the bacterial medium, the trp operon is When abundant tryptophan is present in the bacterial medium, the trp operon is

that is wrong, its not thymus.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.

you should wear a lead protective shield when having teeth x-rays

hope i

-lavira : )