Multiple Choice
Which of the following hormones is thought to act at the cellular level by inducing a change in gene expression?
43. Endocrine System
Endocrine System
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In insects, ecdysteroid is released __________.
A
from neurosecretory cells in the brain
B
only when juvenile hormone levels are low
C
from the insect's pupa
D
in response to stress in the insect
E
in response to prothoracicotropic hormone
Verified step by step guidance1
Understand the role of ecdysteroids in insects: Ecdysteroids are hormones that play a crucial role in molting and metamorphosis in insects.
Identify the source of ecdysteroid release: Ecdysteroids are released from the prothoracic glands in response to specific hormonal signals.
Recognize the trigger for ecdysteroid release: The release of ecdysteroids is stimulated by the prothoracicotropic hormone (PTTH), which is secreted by neurosecretory cells in the insect brain.
Differentiate between the roles of juvenile hormone and ecdysteroids: Juvenile hormone levels regulate the timing of development stages, while ecdysteroids trigger molting and metamorphosis.
Conclude that ecdysteroid release is specifically in response to prothoracicotropic hormone, not directly from stress or low juvenile hormone levels.
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