Question

exit ticket: rna and protein synthesis

1. what is the mrna strand that would be created from the following dna:

atg	cca	tat	gag	aaa	tat

Explanation:

Step1: Recall DNA to mRNA base pairing

In transcription, DNA's adenine (A) pairs with mRNA's uracil (U), thymine (T) pairs with adenine (A), cytosine (C) pairs with guanine (G), and guanine (G) pairs with cytosine (C).

Step2: Transcribe each DNA codon

• For DNA codon ATG: A→U, T→A, G→C → UAC
• For DNA codon CCA: C→G, C→G, A→U → GGU
• For DNA codon TAT: T→A, A→U, T→A → AUA
• For DNA codon GAG: G→C, A→U, G→C → CUC
• For DNA codon AAA: A→U, A→U, A→U → UUU
• For DNA codon TAT: T→A, A→U, T→A → AUA

Answer:

The mRNA strand is UAC, GGU, AUA, CUC, UUU, AUA (filling the table cells respectively as UAC, GGU, AUA, CUC, UUU, AUA).