Question

A parent strand of DNA with the base sequence TAC GCT AAT is used to transcribe a strand of mRNA. What is the sequence of bases on the complementary strand of mRNA?

Answer 1

AUG CGA UUT

Step-by-step explanation:

It is customary to divide the nitrogen bases into two groups: the puric bases, adenine (A) and guanine (G); and pyrimids, cytosine (C), thymine (T) and uracil (U).

In DNA the nitrogenous bases are A-G-C-T, RNA has the same bases, with the exception of Timine, which is replaced by Uracil. These bases are complementary to each other. This complementarity is presented as follows: Adenine is complemented with thymine in DNA and uracil in RNA, while Guanine is complemented with cytosine in DNA and RNA. This complementarity is important for the connection between the two strands of DNA and for the formation of mRNA.

In this case, if a DNa strand has the TAC GCT AAT base sequence, the formed mRNA will have the AUG CGA UUT base sequence due to the complementarity of the nitrogenous bases.

Answer 2

Answer: ATG CGA TTA

Explanation:According to the DNA base pairing rule also known as Chargaff’s rule, Adenine and Thymine are base complements (A - T) while Guanine and Cytosine are base complements (G - C) and vice versa .