After encountering an antigen, an animal has memory cells that can produce antibodies quickly. In the absence of the antigen
A) Memory cells die off.
B) Memory cells don't produce antibodies at all.
C) Memory cells produce few antibodies.
D) Memory cells are totally inactivated.
Answer: C
You might also like to view...
Before the discovery of these glands, thyroid surgery often led to a rapid drop in blood calcium levels, which triggered muscle contractions and cardiac arrhythmias. What glands are these and which hormone is lacking?
A) thyroid glands; calcitonin B) parathyroid glands; calcitonin C) parathyroid glands; parathyroid hormone D) thyroid glands; levothyroxine E) parathyroid glands; levothyroxine
Which of the following statements describes the effect of hormones secreted by the thymus gland?
A. These hormones lower blood Ca2+ levels. B. These hormones stimulate growth. C. These hormones increase blood glucose levels. D. These hormones stimulate the development of the immune system. E. These hormones increase blood Ca2+ levels.
Which of the following is NOT a form of phosphorylation?
a) Reduction phosphorylation b) Substrate level phosphorylation c) Oxidative phosphorylation d) Photophosphorylation e) None of these choices
Which of the following cells are involved in cellular immunity?
A) Lymphocytes B) Phagocytes C) Leucocytes D) A and B