A child is infected with chicken pox (Varicella-Zoster virus), which triggers a primary immune response. The memory cells produced to suppress further attacks by chicken pox consist of
A. B cells only.
B. both B cells and T cells.
C. T cells only.
D. neither B cells nor T cells.
Answer: B
You might also like to view...
What causes the opening and closing of the heart valves?
A. The action of the papillary muscles and chordae tendineae B. A pressure difference on the two sides of the valve C. Turbulent flow in the atria and ventricles D. Na+ and K+ fluxes during ventricular depolarization E. Stimulation by the sympathetic and parasympathetic nerves
Describe the steps involved in hemostasis. Compare the extrinsic and intrinsic pathways of coagulation
What will be an ideal response?
Thyroxine-binding globulin is
a. a transport protein in the blood plasma. b. a colloid found in the thyroid follicles. c. a receptor for T4 found in its target cell nuclei. d. a releasing factor that stimulates secretion of thyroxine. e. a receptor for T4 found in its target cell plasma membranes.
The partial pressure of oxygen in arterial blood is approximately
A) 40 mm Hg. B) 45 mm Hg. C) 50 mm Hg. D) 70 mm Hg. E) 100 mm Hg.