Which of the following is true of axons?
a. axons use chemically gated ion channels to generate graded potentials.
b. a neuron can have only one axon, but the axon may have occasional branches along its length.
c. smaller (thinner) axons are more likely to bear myelin sheaths than larger (thicker) axons.
d. neurons can have multiple axons but only one dendrite.

In which of the following ways is the function of the surface of a microsphere similar to the function of an actual cell membrane? a.both make it possible for the conditions in the interior to be different from the conditions outside. b.both provide a barrier that keeps water from flowing across it so the interior remains dry. c.both separate the rna that forms in the interior from any rna that might form in the environment. d.both can actively move molecules into the interior or out into the surrounding environment.

Did you know that a single bee would have to go to over 2 million flowers to make a single pound of honey?

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.