Examine the amino acid sequences from three organisms (A, B, and C). Which two organisms are the most closely related?

Organism A: Val-Ser-Thr-Val

Organism B: Leu-Ala-Leu-Ala

Organism C: Val-Ser-Asp-Met

(1 point)
Responses

B & C
B & C

A & B
A & B

A & C
A & C

They are all equally related.

1 answer

To determine which two organisms are the most closely related based on their amino acid sequences, we can compare the sequences of each organism.

  • Organism A: Val-Ser-Thr-Val
  • Organism B: Leu-Ala-Leu-Ala
  • Organism C: Val-Ser-Asp-Met

Comparison:

  • Organism A vs. Organism B: There are no identical amino acids in the sequences.
  • Organism A vs. Organism C: The first two amino acids (Val-Ser) are identical.
  • Organism B vs. Organism C: There are no identical amino acids in the sequences.

Conclusion: Organisms A and C share two identical amino acids (Val and Ser), while Organism B has no similarities with either A or C. Therefore, A and C are the most closely related.

The correct response is: A & C