The correct example about the relationship between the insect hormones ecdysteroid and PTTH is interaction of the endocrine and nervous system. Hence, Option A is correct.
ENDOCRINE SYSTEM:
It is a complex system which is under hormonal control. Hormones are released by the glands and it cordinates body functions from metabolism to growth and development.
NERVOUS SYSTEM:
It is a complex system consisting of organised group of cells called neurons that carry messages from brain and spinal cord to other various body parts.
As PTTH (prothoracicotropic hormone) stimulates prothoracic gland of an insect that triggers the release of ecdysone hormone for the stimulation there should be an neuroendocrine mechanism. Thus, Option A is correct.
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Answer:
The nature(hydrophilic or hydrophobic) of the molecule to be transported across the membrane determines whether that molecule can cross the cell membrane or not.
Explanation:
Plasma membrane composed of lipid bilayer in which hydrophilic glycerol head groups of phospholipids in each monolayer are arranged oppositely with respect to each other whereas the nonpolar hydrophobic tail of both the monolayer faces each other.
The plasma membrane only allow the hydrophobic or nonpolar molecules to pass through its phospholipid bilayer but resist the passage of hydrophilic molecules or polar molecules through it.
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