Dibenzoylhydrazines are a category of molecules that have been used as insecticides. They work by blocking ecdysteroid receptors. How does this kill an insect?
A. The insect can no longer excrete nitrogenous wastes.
B. The insect cannot molt.
C. The insect can no longer coordinate its movements.
D. The chitinous exoskeleton is dissolved.
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
Gather Content
· What do you already know about ecdysis?
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
B. The insect cannot molt.
Clarify Question
· What is the key concept addressed by the question?
o This question addresses ecdysis.
· What type of thinking is required?
o This question is asking you to analyze the information given, using logic, to dissect the problem and determine the answer.
Gather Content
· What do you already know about ecdysis?
o The Ecdysozoa comprises animals that molt. When an animal grows large enough that it completely fills its hard external skeleton, it must lose that skeleton by molting (ecdysis).
o While the animal grows, it forms a new exoskeleton underneath the existing one. The first step in molting is for the body to swell until the existing exoskeleton cracks open and is shed. Upon molting that skeleton, the animal inflates the soft, new one, expanding it using body fluids (and sometimes air). When the new exoskeleton hardens, it is larger than the old one and has room for growth.
o So unlike other animals, the growth of ecdysozoans is step-wise.
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
o Ecdysteroid hormones bind to ecdysteroid receptors to regulate molting.
o So these insecticides kill insects by blocking the ability to molt.
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
o The question required you to analyze the information given, using logic, to dissect the problem and determine the answer.
o Did you recognize that ecdysteroid hormones and their receptors are essential for insect molting?
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