____ are produced by B cells and possess antibodies attached to their cell surfaces. The cells play a pivotal role in the secondary immune response
Fill in the blank with the appropriate word.
Memory cells
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What are chemical messengers that control growth differentiation and the metabolism of specific target cells called?
a) hormones b) neurons c) glands d) second messengers
What is the correct order that a motor nerve impulse travels when triggering a muscle contraction?
A. motor nerve-sarcolemma-synaptic cleft-sarcoplasmic reticulum-troponin B. motor nerve-sarcolemma-sarcoplasmic reticulum-synaptic cleft-troponin C. motor nerve-synaptic cleft-sarcolemma-troponin-sarcoplasmic reticulum D. motor nerve-synaptic cleft-sarcolemma-sarcoplasmic reticulum-troponin E. motor nerve-sarcoplasmic reticulum-synaptic cleft-sarcolemma-troponin
Which of the following statements about M protein is FALSE?
A) It is found on Streptococcus pyogenes. B) It is found on fimbriae. C) It is heat- and acid-resistant. D) It is readily digested by phagocytes. E) It is a protein.
Properties that contribute to virulence
A) are determined by both the microbe and the host, and are fixed and unchanging. B) are determined solely by the microbe. C) are determined solely by the host. D) are fixed and unchanging. E) are determined by both the microbe and the host, and may evolve over time.