Below is a diagram of the coding strand of DNA showing a gen

Below is a diagram of the coding strand of DNA showing a gene please use this image for questions 3 and 4). The arrow represents the transcription start site. Which region contains the 3\' Untranslated Region (UTR)? A B C D E

Solution

Answer: D

Reason:

When transcription occurs, the m RNA formed is longer than the actual RNA code for protein . It has few bases at 5’ and 3’ end to protect its degradation in cell environment. While translation, which started at middle of exon 1 and stopped at the middle of exon 3, Exon 1 has few portion (C), and exon 3 has few portion (D), which is not undergoing translation. These regions are known as translated regions at 5’ (C) and 3’ (D) end respectively. DNA has 5’ (in diagram) and 3’ (opposite end, not shown in diagram).