In your textbook, there is a discussion of the experiment by Wigglesworth that demonstrated that PTTH (prothoracicotropic hormone) triggers molting and the release of ecdysone
In
1984, Nagasawa et al. published a paper entitled: "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 invertebrates.
B. if PTTH were given to vertebrates it would
likely trigger glucose uptake by cells.
C. insulin causes molting in vertebrates.
A
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