List of top Biochemistry Questions on DNA replication, transcription and translation

Which one or more of the following statements correctly describe(s) the changes upon the addition of puromycin during eukaryotic translation?
A hypothetical plant gene ADSH22 is encoded by the nuclear genome. The length of the mature mRNA for ADSH22 is 2150 nucleotides (nts). This mRNA has a 270 nts long 5' UTR and 200 nts long 3' UTR. Taking average molecular weight of an amino acid as 115 Dalton (Da), the calculated molecular weight of ADSH22 protein is ________ kDa (round off to 1 decimal place).
Two RNAs shown below were used separately as templates in an in vitro translation system, which can generate proteins in all possible reading frames. \[ RNA_1: 5' - (AG)_n - 3' \quad \text{and} \quad RNA_2: 5' - (AAG)_n - 3' \] The RNA_1 translated product contained Arg and Glu. The RNA_2 translated product contained Arg, Glu, and Lys. Which one of the following codons directs the incorporation of Arg?