Question

Consider the following DNA template strand:

3’            ATC        CAG       ATG        AAC        AGC       AAT        5’
Which is the correct complementary mRNA strand?
5’            UAG       GUC       UAC       UUG      UCG       UUA      3’
5’            ATC        CAG       ATG        AAC        AGC       AAT        3’
3’            UAG       UCG       UAC       UUG      GUC       UUA      5’
3’            TAG        GTC        TAC        TTG        TCG        TTA        5’

Answer 1

The correct complementary mRNA strand to the given DNA template strand is 5' UAG GUC UAC UUG UCG UUA 3', following the base pairing rules where uracil in RNA replaces thymine in DNA.

Step-by-step explanation:

The correct complementary mRNA strand to the given DNA template strand 3' ATC CAG ATG AAC AGC AAT 5' is 5' UAG GUC UAC UUG UCG UUA 3'. This is because during transcription, adenosine (A) on the DNA template pairs with uracil (U) in RNA, cytosine (C) pairs with guanine (G), guanine (G) pairs with cytosine (C), and thymine (T) pairs with adenine (A). As such, the DNA-RNA base pairing rules dictate that the sequence on the mRNA will be the reverse complement of the DNA template strand, with uracil replacing thymine.