Question

A ligand will cause a cell to respond if it connects with the right ________________.

active site
receptor
enzyme
phospholipid

Answer 1

Well, honestly to me, there is only one answer that truly stands out.

Active site - is on the enzyme when a substrate binds
receptor - anything can bind to this
enzyme - a substrate can bind to this, and for the most part that is it
phospholipid - this is a protein usually most of the time nothing binds to this.

which one do you think works the best out of these answers?