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Multiple Choice
A particular triplet of bases in the template strand of DNA is 5′-AGT-3′. What would be the corresponding codon for the mRNA that is transcribed?
A
3′-UCA-5′.
B
3′-UGA-5′.
C
5′-TCA-3′.
D
3′-ACU-5′.
Verified step by step guidance
1
Identify the direction of the DNA template strand, which is given as 5′-AGT-3′.
Understand that during transcription, the mRNA is synthesized in the 5′ to 3′ direction, complementary to the DNA template strand.
Determine the complementary RNA bases for each DNA base: Adenine (A) pairs with Uracil (U), Guanine (G) pairs with Cytosine (C), and Thymine (T) pairs with Adenine (A).
Apply the base pairing rules to the DNA template strand 5′-AGT-3′ to find the mRNA sequence: A pairs with U, G pairs with C, and T pairs with A, resulting in the mRNA sequence 3′-UCA-5′.
Verify the direction of the mRNA sequence to ensure it is written from 5′ to 3′, which confirms the correct mRNA codon is 3′-UCA-5′.