Examine the amino acid sequence 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
A and B
They are all equally related.

1 answer

To determine which two organisms are the most closely related based on the provided 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 the sequences:

  • Organism A and Organism C have two identical amino acids: Val and Ser.
  • Organism B has different amino acids (Leu and Ala) that do not match any in Organism A or Organism C.

Based on the similarities, A and C are the most closely related because they share two out of four amino acids, while B shares no amino acids with either A or C.

So, the correct response is:

A and C.