When a __________ reaches its __________ , there is a specific means of receiving it and acting on the message. This task is the responsibility of specialized proteins called __________ .
1. signaling molecule; receptor; G proteins
2. signaling molecule; target cell; G proteins
3.signaling molecule; target cell; receptors
4.kinase; receptor; proteases
Posted Date:-2021-03-07 12:04:17