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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

They are all equally related.
They are all equally related.

A & B
A & B

B & C
B & C

A & C
A & C

1 answer

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

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

Let's analyze:

  1. Organism A and Organism C share two identical amino acids (Val and Ser) and differ only in two positions.
  2. Organism A and Organism B share no identical amino acids.
  3. Organism B and Organism C share no identical amino acids.

Based on this analysis, Organism A and C are the most closely related due to the overlap of amino acids.

Therefore, the answer is: A & C.