Answer:
Active immunity
Explanation:
Active immunity is when the body makes its own antibodies to protect against the disease in the future. Passive immunity is when another person or animal's antibodies are introduced to produce immunity.
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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.
Under the leaf, but a microscope must be used.
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