Multiple Choice
What result would you expect following the binding of epinephrine to an α-type epinephrine receptor?
43. Endocrine System
Endocrine System
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Which of the following conditions in a silkworm moth would result in metamorphosis from pupa to adult?
A
High concentration of juvenile hormone and prothoracicotropic hormone
B
Low concentration of juvenile hormone and low prothoracicotropic hormone
C
High concentration of juvenile hormone and low concentration of ecdysteroid
D
High concentration of both juvenile hormone and ecdysteroid
E
Low concentration of juvenile hormone and high concentration of ecdysteroid
Verified step by step guidance1
Understand the role of hormones in insect metamorphosis: Juvenile hormone (JH) and ecdysteroid are key hormones that regulate the transition from pupa to adult in insects.
Juvenile hormone maintains larval characteristics. A high concentration of JH prevents metamorphosis, keeping the insect in its juvenile form.
Ecdysteroid is responsible for initiating molting and metamorphosis. A high concentration of ecdysteroid promotes the transition to the adult stage.
Identify the correct hormonal conditions for metamorphosis: For a silkworm moth to transition from pupa to adult, juvenile hormone levels must be low to allow adult characteristics to develop, while ecdysteroid levels must be high to trigger the metamorphosis process.
Apply this understanding to the given options: The correct condition for metamorphosis is low concentration of juvenile hormone and high concentration of ecdysteroid, as this combination allows the silkworm moth to progress from pupa to adult.
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