Question

7 which of these dna sequences will produce the following mrna: agc - uac - acu?
a tcg - tac - act
b tcg - atg - tga
c tcg - acg - tga
d agc - tac - act

Explanation:

In DNA - mRNA transcription, the base - pairing rules are A - U (but in DNA, it's T - A in the sense of complementary base - pairing for transcription as mRNA has U instead of T), T - A, C - G, and G - C.
For the mRNA sequence AGC - UAC - ACU:

• For the first codon AGC: The complementary DNA bases (since DNA has T instead of U) would be TCG (because A pairs with T, G pairs with C, C pairs with G).
• For the second codon UAC: The complementary DNA bases would be ATG (U pairs with A, A pairs with T, C pairs with G).
• For the third codon ACU: The complementary DNA bases would be TGA (A pairs with T, C pairs with G, U pairs with A).

Answer:

B. TCG - ATG - TGA