A cell is only able to respond to hormones if specific hormone receptors are present in this cell, which is why it can be called a target cell.

Ectocarpene is a volatile, sperm cell-attracting material released by the eggs of the seaweed ectocarpus siliculosus. its constitution is all the double bonds are cis, and the absolute configuration of the chirality center is s. draw a stereochemically accurate representation of ectocarpene.

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

Pl as time goes by and water goes through the water cycle again and again, the amount of water on earth: increases decreases ostays the same goes up and down