Necrosis ____.
a. is a programmed mechanism of cell death
b. is cell death caused by an injury or a toxic substance
c. promotes the survival and growth of dendrites
d. promotes the activity of neurons
Question 2
Blood cells that attach to types of tumor cells and cells infected with viruses are known as ____.
a. B cells
b. T cells
c. cytotoxic T cells
d. natural killer cells