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A codon chart is shown here.

Select the amino acids that will be produced by the DNA template strand sequence:

TAC GTG TCA TTT ATT

Select FIVE amino acids by clicking on the codon chart. Selected answers appear shaded.

1 answer

To determine the amino acids produced by the given DNA template strand sequence (TAC GTG TCA TTT ATT), we first need to transcribe this template strand into mRNA. The transcription involves replacing thymine (T) with uracil (U) in the RNA sequence.

  1. DNA Template Strand: TAC GTG TCA TTT ATT
  2. mRNA Sequence:

    • DNA: TAC

    • mRNA: AUG (Start codon)

    • DNA: GTG

    • mRNA: CAC

    • DNA: TCA

    • mRNA: AGU

    • DNA: TTT

    • mRNA: AAA

    • DNA: ATT

    • mRNA: UAA (Stop codon)

So, the full mRNA sequence is AUG CAC AGU AAA UAA.

Now we can break this mRNA sequence into codons (groups of three nucleotides):

  1. AUG - Methionine (Met) - Start codon
  2. CAC - Histidine (His)
  3. AGU - Serine (Ser)
  4. AAA - Lysine (Lys)
  5. UAA - Stop codon (does not code for an amino acid).

Thus, the amino acids produced from the mRNA sequence before the stop codon are:

  • Methionine (Met)
  • Histidine (His)
  • Serine (Ser)
  • Lysine (Lys)

In total, there are four amino acids produced before reaching the stop codon.

If you need to select five amino acids but only have four, acknowledge that there are no additional amino acids produced beyond what is translated from the mRNA sequence. Hence, you may simply select the four (Met, His, Ser, Lys) from the codon chart.