In Your Textbook, There Is a Discussion of the Experiment

question 90

Multiple Choice

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:

• A)a common ancestral peptide evolved into peptides with different functions in insects and vertebrates.
• B)PTTH must be involved with glucose metabolism in insects.
• C)insulin causes molting in vertebrates.
• D)if PTTH were given to vertebrates, it would likely trigger glucose uptake by cells.

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