The covalent backbone of DNA and RNA consists of: a. alternating phosphate groups and nitrogenous bases. b. alternating phosphate groups and pentose residues. c. alternating pentose residues and nitrogenous bases. d. alternating pentose residues and cyclic nucleosides. e. None of the answers is correct.

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.

it would affect precipitation by causing flooding in some areas of the world due to climate increasing, causing the glaciers in the northern and southern pole of our planet to melt.

i wish you would have provided choices to simplify it and allow me to give an exact answer.