MRSA, a bacteria, is highly resistant to many antibiotics. Which has most likely contributed to the evolution and spread of this bacterium

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.

the answer is b.) hydrogen bonds between bases.