T cells _______.
A. all carry out the same function
B. arise and finish development in the bone marrow
C. are responsible for cell-mediated immunity
D. make antibodies
C. are responsible for cell-mediated immunity
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Which of the following pathways for complement activation is generally dependent upon the formation of antigen-antibody complexes?
A. Classical pathway B. Lectin complement pathway C. Alternative pathway D. All of the choices are correct.
Two proteins, Rag-1 and Rag-2, catalyze VDJ recombination. Where would you expect these proteins to be expressed?
A. thyroid and parathyroid B. bone marrow only C. bone marrow and thymus D. thyroid only E. blood serum Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about antibodies? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Respond to the statements 100–104 with reference to the four
steps of the nitrogen cycles listed below. a. nitrogen fixation b. nitrification c. denitrification d. ammonification M 100. The action of bacteria on nitrogen-containing wastes involves this process. M 101. The action of bacteria on ammonia, ultimately converting it to nitrate, involves this process. E 102. The action of bacteria on nitrates, converting them to gaseous nitrogen, involves this process. E 103. The conversion of gaseous nitrogen first to ammonia and then to other nitrogenous compounds involves this. E 104. The process whereby nitrite is converted to nitrate is an important part of this process.
The most common route of transmission for true pathogenic fungi is ingestion of spores.
Answer the following statement true (T) or false (F)