Human and sperm whale myoglobin have very similar primary structures. Which of the following statements are correct? 1) The two proteins are very likely related evolutionarily. 2) The differences in the sequences in many instances represent a conservative change (such L for I). 3) The differences in the sequences in many instances represent a nonconservative change (such as D for A). 4) There is no correlation between the two proteins, since they originate from very different species.

Option (1) and (2).

Explanation:

Myoglobin may be defined as an important protein present in the muscle tissue that has the ability to bind with oxygen and iron. This protein is the primary oxygen carrying pigment of the body.

The sperm and human whale has similar primary structures. The similarity in the primary structure may occur due to the evolutionary relation between two proteins as they may have common ancestor. The conservative changes may have occur that makes the protein quite different but still they share some conserved sequences.

Thus, the correct answer is option (1) and (2).