State the sporopollenin significance with reference to its chemical nature.

OR

(a) Name the enzyme responsible for the transcription of tRNA and the amino acid the initiator tRNA gets linked with.

(b) Explain the role of initiator tRNA in the initiation of protein synthesis.

The significance of sporopollenin with reference to its chemical nature is that it can withstand high temperature, strong acids and alkali because it is one of the most resistant organic substances.

OR

(a) The enzyme responsible for the transcription of tRNA is RNA polymerase III and the amino acid with which the initiator tRNA gets linked with is methionine.

(b) The Initiator tRNA carries amino acid methionine at its amino acid binding site. Initiator tRNA binds with the codon (AUG) present on the mRNA and initiates protein synthesis/translation.