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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: LExamine 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

A and C
A and C

B and C
B and C

A and B

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

Comparison:

  • Organism A and Organism C:

    • Both share the amino acid "Val" at the first position and "Ser" at the second position.
    • The third amino acids are different (Thr in A and Asp in C).
    • The fourth amino acids are the same (Val in A).

  • Organism A and Organism B:

    • There are no matching amino acids in any position.

  • Organism B and Organism C:

    • There are no matching amino acids in any position.

Based on this comparison, Organism A and Organism C share more similarities (2 out of 4 amino acids) than A does with B or B does with C.

Therefore, the answer is A and C.