Answer:
can u provide me options?? If possible I will surely help..
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.
Selective pressure can be a driving force of evolution; option A.
<h3>What is selective pressure?</h3>
Selective pressure refers to external forces which affect an organism's ability to survive in a given environment.
Selective pressure can either decrease or increase the occurrence of a trait.
Therefore, selective pressure can be a driving force of evolution.
Learn more about selective pressure at: brainly.com/question/1538410
#SPJ1
Over the years, greater controversy has arisen over environmental issues as the issues addressed have become more complex and less easily identifiable.
