Which cells require specific antigens to become activated?
a. dendritic
b. B and T cells
c. macrophages
d. phagocytes
e. cytokines
ANSWER: b
You might also like to view...
A positive effect associated with pesticide usage is
1.killing disease-causing insects. 2.killing some pathogens. 3.increasing food supplies. 4.increasing profits for farmers. 5.all of the choices
What physiological processes occur in response to an increase in blood pressure? What will be an ideal response?Concepts to Consider: Baroreceptors in the walls of the arteries and heart are sensitive to blood
pressure changes. Increases in blood pressure stretch baroreceptors; message is sent to medulla; cardiac center of brain stimulates parasympathetic nerves that slow the heart down; pressure is lowered. Also, vasomotor center of brain inhibits sympathetic nerves that cause vasodilation, so pressure is lowered
The binomial system of classification was developed by:
A) Darwin B) Wallace C) Linnaeus D) Malthus E) none of the above
A signal sequence in the polypeptide chain targets all but _______ proteins to the rough ER surface.
a. secreted b. plasma membrane c. mitochondrial d. lysosomal