Aparticle can infect humans and make them sick. it attaches to a host cell and injects its rna, which the host uses to make proteins for the particle. this particle cannot reproduce on its own and can only copy itself by using the machinery of the host.

which explains whether the particle described is a virus or a cell?

a.
the particle is a virus because it has genetic information and can infect humans.
b.
the particle is a virus because it makes proteins but cannot reproduce by itself.
c.
the particle is a cell because it has genetic information and attaches to other cells.
d.
the particle is a cell because it does not make proteins and cannot reproduce by itself.

Antoine manages a number of apartment buildings that use natural gas for heating, cooking, and laundry. the scatter plot shows the correlation between the outside air temperature and antoine's natural gas bill. which type of correlation does the plot illustrate?

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.

What blood vessels carry blood to the heart? away from the heart?