Which of the following represents an activity within a population? a.
the absorption of nitrogen by bacteria and converting it to a form useful to plants
b.
moss growing on the north side of a large pine tree
c.
a virus causing rabies in a dog
d.
a peacock spreading and shaking his feathers to attract a female
e.
a fox consuming a rabbit

Which of these is true for bacteria because they are prokaryotic cells? a. they can engulf body cells in order to make memory cells. b. they must invade viruses in order to reproduce. c. they are much larger than eukaryotic body cells. d. they can reproduce on their own outside of other cells.

Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.

Which of the following shows the results that you would get if you tested beef using the four tests in the gizmo