The primary function of a phagocyte is to
A) destroy pathogens.
B) engulf pathogens.
C) evade pathogens.
D) both engulf and destroy pathogens.
Answer: D
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Macrophages are phagocytic cells.
Answer the following statement true (T) or false (F)
Imagine you conduct a parabiosis experiment with two strains of mice, one of which lacks a functional leptin gene (ob strain) while the other lacks a functional receptor for this hormone (db strain). Which of the following outcomes would you observe?
A. no weight change in the ob mouse B. no weight change in the db mouse C. increased body weight in the ob mouse D. decreased body weight in the ob mouse E. decreased body weight in the db mouse
Which of the following organisms is a multi-celled producer?
a. an oak tree b. Candida, a pathogenic fungus c. E. coli, a common intestinal bacterium d. a Siberian tiger e. an archaeon on the seafloor
The process of clonal selection gives rise to short-lived clones called ________, which combat the antigen that stimulated their production.
A) helper cells B) antibodies C) memory cells D) effector cells E) antigens