What cell type secretes interleukin-2 to facilitate B cell proliferation into memory B cells in addition to effector cells?
A) helper T cells
B) mast cells
C) macrophages
D) natural killer cells
E) plasma cells
Ans: A) helper T cells
You might also like to view...
Which of the following is not a type of phagocyte?
A. Lymphocyte B. Kupffer cell C. Neutrophil D. Macrophage E. Monocyte
Plasma cells and memory cells are types of ________ lymphocytes; both types of cells secrete proteins called ________ as part of the immune response
Fill in the blank(s) with correct word
A person may have a muscle injury that really affects the tendon and not the muscle tissue itself. Why is it that after a hard workout, muscle pain will go away in a few days at most, but tendinitis lasts so much longer?
A) The electrical signals that muscle cells generate are used to aid in healing. B) Muscle cells can be rested, but tendons have to be used all the time. C) Unlike a tendon, muscle tissue has an ample blood supply, so it's easier to repair. D) Muscle cells are more elastic, so they are harder to damage.
A male from one species meets a female from its sister species. They mate but the progeny produced are sterile. This is an example of:
a. reproductive character displacement. b. a hybrid zone. c. prezygotic isolation. d. postzygotic isolation.