Phytophthora infestans is an organism that causes the serious potato disease known as potato blight. the effect of phytophthora infestans was most pronounced in ireland in 1845-57. it killed most of the potato crop which caused over one million people to starve to death. what type of organism is phytophthora infestans.

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.