A few steps involved in polypeptide synthesis are given below. In which of them, the tRNA participates?

I. Activation of amino acids

II. Elongation of the polypeptide chain

III. Translation

IV. Transcription

Match the animals of Column $\mathrm{I}$ with Column $\mathrm{II}$ and select the correct options among the following:

Select the code for the correct answer from the options given below.

Write a possible RNA strand that can be transcribed from the above DNA molecule formed.

Give the plausible explanation for the following:

The two strands in DNA are not identical but are complementary.