Structurally similar RTKs have been found in all multicellular animals, suggesting that ____.
A) RTK genes are resistant to mutation
B) RTKs evolved relatively early in the history of animals
C) RTKs evolved from G proteins
D) RTKs are not involved in vital processes in animals
E) RTKs have evolved independently of each other in animals

Question

Quizplus · Accepted Answer

The structural similarity of receptor tyrosine kinases (RTKs) across all multicellular animals suggests that these proteins evolved early in the history of animals. This is because such widespread conservation across diverse species typically indicates an ancient origin.

Structurally Similar RTKs Have Been Found in All Multicellular Animals