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
Looking at the sequences:
- Organisms A and C share the first two amino acids (Val-Ser), while B has completely different amino acids (Leu-Ala).
- Organism C has an Asp in the third position instead of Thr from A, but this is still a partial similarity.
- Organisms A and B do not have any amino acids in common at any position, meaning they are not related based on the sequences provided.
Based on this examination, Organisms A and C are the most closely related due to the similarity in the first two amino acids (Val and Ser).
Therefore, the best response is:
A & C