Compare the growth of a science<span> with the </span>evolution<span> of a living species. </span>Zeitgeist<span> is the intellectual and cultural climate spirit of a time. It means that a certain </span>scientific<span> discovery can be discarded or shunned because it is ahead of its time or maybe, because people are not willing to accept it.</span>
<span>It binds itself to the receptors present on the surface of the cell membrane, which activates the enzymes present inside cell. Then It passes through the cell membrane and attaches itself to a receptor protein present in the cytoplasm.
It passes on the signal to the secondary messengers inside the cell, which activate the receptors on the cell membrane.</span>
