Question

1. hemoglobin is an important protein in red blood cells. the dna code for hemoglobin contains the following segment. tgc-gga-ctc-ctc

which of these is the messenger rna code for this segment of dna? (sc912l16.5)
a. ucg-cca-gug-gug
b. acg-cct-gaa-gaa
c. ucg-cct-gtg-gtg
d. acg-ccu-gag-gag

Explanation:

Step1: DNA to mRNA base - pairing rules

In transcription, DNA bases pair with mRNA bases as follows: \(T\) (thymine in DNA) pairs with \(A\) (adenine in mRNA), \(A\) (adenine in DNA) pairs with \(U\) (uracil in mRNA), \(G\) (guanine in DNA) pairs with \(C\) (cytosine in mRNA), and \(C\) (cytosine in DNA) pairs with \(G\) (guanine in mRNA).
The DNA segment is \(TGC - GGA - CTC - CTC\).
For the first triplet \(TGC\):
\(T\to A\), \(G\to C\), \(C\to G\), so it becomes \(ACG\).
For the second triplet \(GGA\):
\(G\to C\), \(G\to C\), \(A\to U\), so it becomes \(CCU\).
For the third triplet \(CTC\):
\(C\to G\), \(T\to A\), \(C\to G\), so it becomes \(GAG\).
For the fourth triplet \(CTC\):
\(C\to G\), \(T\to A\), \(C\to G\), so it becomes \(GAG\).
The mRNA sequence is \(ACG - CCU - GAG - GAG\) (option D).

Answer:

D. ACG - CCU - GAG - GAG