Question

Cytochrome c is a protein that helps release energy from food and is produced by nearly all organisms. The table shows a short sequence of the amino acids in cytochrome c for several species.



Identify the organism that is MOST CLOSELY related to tuna AND explain your reasoning using evidence from the table.

Think about the information carefully. Then enter your response in the box provided.

Answer 1

I don’t have the table you mention, so I can’t pick the exact organism yet. Please either paste the amino‑acid sequences from the table or upload a picture of it.

In the meantime, here’s how to decide and how to phrase your answer when you have the data:

1. Compare the tuna sequence to each other species’ sequence position by position.
2. Count how many amino acids are identical between tuna and each species.
3. The organism with the highest number of identical amino acids (or the fewest differences) is the most closely related to tuna.

Answer template you can use once you have the counts:
- “The organism most closely related to tuna is [organism]. Its cytochrome c sequence matches tuna’s at [N] out of [total positions] amino acids (only [X] differences), which is more matches (fewer differences) than any other species in the table. This greater similarity indicates a closer evolutionary relationship.”

Send the table or sequences and I’ll identify the organism and show the counts.