Which characteristics describe the genetic code of humans? Select three options
contains over 3 billion base pairs
can only help understand human genetics
can help explain genetic diseases
composed of about 19 000 genes
composed of 23 chromosomes

You are observing different types of cells in your science lab. one cell has many chloroplasts. what is the most likely function of this cell? a. energy production b. photosynthesis c. reproduction d. digestion

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.

Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil