In your textbook, there is a discussion of the experiment by Wigglesworth, which demonstrated that PTTH (prothoracicotropic hormone) triggers molting and the release of ecdysone. In 1984, Nagasawa et al. published a paper titled: "Amino-terminal amino acid sequence of silkworm prothoracicotropic hormone: homology with insulin." The similar amino acid sequence between PTTH and insulin suggests that:

Question

Quizplus · Accepted Answer

The similar amino acid sequence between PTTH and insulin suggests that they may have evolved from a common ancestral peptide that had different functions in insects and vertebrates. It does not suggest that PTTH is involved with glucose metabolism in insects, or that insulin causes molting in vertebrates, or that PTTH would trigger glucose uptake by cells in vertebrates.

In Your Textbook, There Is a Discussion of the Experiment