Immature B cells have:
a. Four types of defense mechanisms on their cell membrane
b. Several kinds of defense mechanisms on their cell membrane
c. One specific kind of defense mechanism on their cell membrane
d. No defense mechanisms on their cell membrane

Mucous membranes.. a. cover or line external surface of body. b. line internal body surfaces that are in contact with the environment. c. produce antibodies to combat infection. d. secrete sweat, which has antibacterial enzymes.

Antibiotics are given when an std is caused by a virus. true or false

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