(a) (i) Watson and Crick's discovery of double helical structure was based on which two findings. Also mention the name of the scientists associated with these findings. [2]
(ii) Write down the salient features of double helix structure of DNA (any three points). [3]
OR
(b) Given below is a stretch of DNA showing the coding strand of structural gene of transcription unit.
5' - ATG ACC GTA TTT TCT GTA GTG CCC GTA CTT CAG GCA TTA 3'
(i) Write the corresponding template strand and m-RNA strand that will be transcribed along with its polarity. [2]
(ii) If GUA of transcribed mRNA is an intron, then depict the sequence involved in formation of mRNA / mature / processed hnRNA strand:
(1) In a bacterium [1]
(2) In humans [1]
(iii) How many amino acids the resulting polypeptide will have after the process of translation in humans? [1]
5 marks· E· DNA Double Helix / Transcription and Splicing