Which metaphor for aging does shakespeare use in sonnet 73? a. air b. choirs c. birds d. autumn

The correct answer is option D. Autumn.

The line 'When yellow leaves, or none, or few, do hang  Upon those boughs' states the presence of a few leaf on the branch of tree, by this line, the poet want to convey the message of the dullness of the old-age, which is similar to the autumn trees.

The line 'which shake against the cold' further confirms the autumn season, as in autumn season, the tree shed their leaves and a few leaves are left and that to are pale and faded. Also, through this line, the shaking of the leaves signify the difficulties in handling the situations during old age.

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.