Question

transcription and translation
what is the correct complementary nucleotide sequence for mrna when the dna nucleotide sequence is c t a c g a?

Explanation:

Step1: Recall base - pairing rules

In transcription, DNA base pairs with RNA. 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.

Step2: Apply base - pairing to the given DNA sequence

The DNA sequence is CTACGA.
For the first base C: it pairs with G.
For the second base T: it pairs with A.
For the third base A: it pairs with U.
For the fourth base C: it pairs with G.
For the fifth base G: it pairs with C.
For the sixth base A: it pairs with U.

Answer:

GAUGCU