Memory B cells do NOT differentiate into plasma cells UNLESS they are __________.
a. stimulated by passive immunization
b. exposed to the same antigen a second time
c. stimulated by active immunization
d. initially subjected to a specific antigen
Answer: b. exposed to the same antigen a second time
You might also like to view...
Exposure to ultraviolet light (sunlight) causes the skin to darken by increasing the production of
A) hemoglobin. B) carotene. C) collagen. D) keratin. E) melanin.
Which blood glucose-lowering hormone is produced by the pancreatic islet cells?
a) Insulin b) Glucagon c) Somatostatin d) Thyroid hormones e) Calcitonin
Which statement is true regarding pseudo-stratified ciliated columnar epithelium?
A) It is well-suited for extreme stretching. B) It contains only one layer of cells. C) Its cells are predominantly cube shaped. D) It consists of many layers of cells.
The sacs containing hydrolytic enzymes are called
A. lysosomes. B. mitochondria. C. centrioles. D. ribosomes. E. nucleus.