Question

11. If the sequence of nucleotides in a template stand of DNA is 3' ATGCTTCCGAAT-5. Write the sequence in the corresponding region of the transcribed m-RNA.
(A) 5'-TAC GAA GGC CTT-3
(B) 5'. UAC GAA GGC UUA-3
(C) 3'-UAC GAA GGC UUA - 5
(D) 3'-TAC GAA GGC CTT-5​

Answer 1

(B) 5' UAC GAA GGC UUA 3' will be the transcribed mRNA strand.

1. RNA polymerase enzyme is responsible for synthesis of RNA from DNA. This enzyme always reads DNA from 3' to 5' direction.
2. Hence, the resultant mRNA strand is in 5' to 3' direction.
3. Moreover, it replaces nitrogenous base Thymine with Uracil.
4. Therefore, option b is correct.
5. Central dogma of life states DNA is replicated, RNA forms through transcription from DNA and transcribed RNA is translated to protein. Each step involves multiple enzymes.