Because of hydrogen bonding, water is uniquely suited for its central role in life. many hydrophilic molecules interact freely with water, but a number of hydrophobic molecules are important for life, too. how does the interaction between water and hydrophobic molecules to organize biological systems?

Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of

Female luna moths (actias luna) attract males by emitting chemical signals that spread through the air. a male hundreds of meters away can detect these molecules and fly toward their source. the sensory organs responsible for this behavior are the comblike antennae visible in the photograph shown here. each filament of an antenna is equipped with thousands of receptor cells that detect the sex attractant. based on what you learned in this chapter, propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air. what predictions does your hypothesis make? design an experiment to test one of these predictions.