In what way is the DNA of a nerve cell different from the DNA of a muscle cell? b
Each cell has its own unique DNA
The DNA is the same but each cell contains different genes
The DNA is the same but different genes are turned on in each cell,
The DNA is different, but each cell contains the same genes.
d

Organisms within a population must compete for resources to survive

The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?

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.