Who enables the breaking of hydrogen bonds between polynucleotide chains and the opening of the double-stranded DNA helix?Phenotypic changes caused by the action of altered external factors of the external environment, that are not inherited, are marked as?
Which of these triplets represents the meaningless codon,illegible or final and does not carry information about any amino acid? 1) UAC 2) UCA 3)UAG 4)UUA