All of the following are protective factors of the skin and its secretions EXCEPT
A) keratin.
B) tightly packed cells.
C) lysozyme production.
D) pyocyanin production.
E) salt.
D
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B cells undergo ____ , where a specific cell will divide in response to its associated antibody recognizing an antigen
Fill in the blank with the appropriate word.
Clostridium botulinum typically does not produce its toxin under conditions that are
A. anaerobic. B. alkaline. C. neutral. D. acid.
Nonnative plant invaders, such as the alfalfa plant bug, are extremely invasive and hard to control because
A. they arrive in new locations where natural predators are not present. B. their populations evolve faster than the plants they attack. C. they tap into the xylem of a plant while seeking carbohydrates. D. cause the plants' stomates to become unevenly distributed within the epidermis. E. they cause the plants' axillary buds to grow out.
After secreting antibodies during an immune response, plasma cells then differentiate into memory cells.
Answer the following statement true (T) or false (F)