Question

1. use the dna sequence below to write the complementary dna, mrna, and amino acid sequence. 3 pts

extra credit: identify the trna anticodon sequence.

Explanation:

Step1: Find complementary DNA

DNA base pairing: A↔T, G↔C.
Original DNA: A T C G C A G C A T T A A A T G A
Complementary DNA: $T\ A\ G\ C\ G\ T\ C\ G\ T\ A\ A\ T\ T\ T\ A\ C\ T$

Step2: Transcribe to mRNA

DNA→mRNA: A→U, T→A, G→C, C→G.
mRNA: $A\ U\ C\ G\ C\ A\ G\ C\ A\ U\ U\ A\ A\ A\ U\ G\ A$

Step3: Translate to amino acids

Split mRNA into codons: AUG (start, Met) is not first here; correct codons: AUC, GCA, GCA, UUA, AAA, UGA
AUC=Ile, GCA=Ala, UUA=Leu, AAA=Lys, UGA=Stop.
Amino Acid Sequence: Ile - Ala - Ala - Leu - Lys - Stop

Step4: Find tRNA anticodons

tRNA pairs with mRNA: A↔U, G↔C.
Anticodons: UAG (for AUC), CGU (for GCA), CGU (for GCA), AAU (for UUA), UUU (for AAA), ACU (for UGA)
tRNA sequence: $U\ A\ G\ -\ C\ G\ U\ -\ C\ G\ U\ -\ A\ A\ U\ -\ U\ U\ U\ -\ A\ C\ T$

Answer:

1. Complementary DNA: T A G C G T C G T A A T T T A C T
2. mRNA: A U C G C A G C A U U A A A U G A
3. Amino Acid Sequence: Ile - Ala - Ala - Leu - Lys - Stop
4. tRNA Anticodon Sequence: U A G - C G U - C G U - A A U - U U U - A C U