Question

18 which of these dna sequences will produce the following m - rna: agc - uac - acu? hint: remember in mrna thymine is replaced by uracil. a tcg - tac - act b agc - tac - act c tcg - atg - tga d tcg - acg - tga

Explanation:

In transcription, DNA is used as a template to synthesize mRNA. The base - pairing rules are: A (adenine) in DNA pairs with U (uracil) in mRNA, T (thymine) in DNA pairs with A (adenine) in mRNA, C (cytosine) in DNA pairs with G (guanine) in mRNA, and G (guanine) in DNA pairs with C (cytosine) in mRNA.
For the mRNA sequence AGC - UAC - ACU:

• For the first triplet AGC:
• A in mRNA pairs with T in DNA, G in mRNA pairs with C in DNA, C in mRNA pairs with G in DNA. So the DNA triplet is TCG.
• For the second triplet UAC:
• U in mRNA pairs with A in DNA, A in mRNA pairs with T in DNA, C in mRNA pairs with G in DNA. So the DNA triplet is TAC.
• For the third triplet ACU:
• A in mRNA pairs with T in DNA, C in mRNA pairs with G in DNA, U in mRNA pairs with A in DNA. So the DNA triplet is ACT.

Answer:

A. TCG - TAC - ACT