15. a ligand that cannot cross the cell membrane can send a message to a cell by
binding to a
receptor, which then
shape.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

[content deleted] - user123802726recklesschicken

answer: wheres the options

explanation:

i think it is dna, i'm not totally sure but i think it might be.