Answer: Substances that are protein based cannot cross the lipid cell membrane, but can exert their effect by binding to the proteins based receptors present on the lipid bilayer.
Explanation:
Hormones such as calcitonin , Parathyroid hormone and pituatry horomones are proteins and water soluble.They cannot cross lipid bilayer but can bind to ligand binding protein receptors.
These receptors are protein macromolecules that are specific in nature for specific hormones.
After binding to the receptors, these hormone-recpetor complexes activate second messengers and regulate the downstream effects.
Answer:
True
Explanation:
Survival of the fittest baby. The better the trait, the more likely a species is to survive.
The axial skeleton consists of the skull, rib cage and vertebral column but her it looks like the appendicular skeleton
Here is a picture of the basic life cycle of a plant.
