Answer the following questions: what do you observe after twenty-four hours? what two molecules (molecular species) are involved in this experiment? in which region was the concentration of water greater—inside or outside the thistle tube—when you first set up the experiment? explain. based on what you have learned about membranes and osmosis, how could you explain the results of this experiment?

Before the can be observed by using a transmission electron microscope, cells are sliced into very thin sections. what disadvantage does this procedure present in the study of cellular parts

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.

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic.