Potable water is
A. foul testing.
B. polluted.
C. safe to drink.
D. contaminated.
E. None of the choices are correct.
Answer: C
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T cells binding to MHC-peptide complexes are responsible for acceptance or rejection of transplanted organs. To facilitate acceptance of the transplant, the ideal donor will have a close genetic relationship with the recipient -- even then, immune suppression drugs are often necessary. In a strange variation of this phenomenon, the endangered Tasmanian devil of Australia suffers from a devastating disease in which tumorous tissue is transmitted from animal to animal. What is the likely explanation for the lack of rejection of this transmissible tumor?
A. MHC genes are unique to humans. Without them, the T cells have no way to distinguish self and non-self. B. Marsupials lack an adaptive immune system. C. Low genetic diversity makes the MHC genes invariant, so the "transplanted" tissue is accepted as self. D. Tumors are never targeted by T cells, unless they are caused by a viral infection. 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 tissue transplants? 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?
Insulin stimulates cells to take in glucose by facillitated diffusion, so insulin receptor-down regulation
increases the ability of cells to take in glucose. __________________ Indicate whether the statement is true or false.
Which phylum includes members that have a body divided into three regions called the visceral mass, head-foot, and mantle?
a. Rotifera b. Mollusca c. Nemertea d. Platyhelminthes
Pox viruses consist of a linear double-stranded DNA genome enclosed in a protein capsid, surrounded by an envelope.
Answer the following statement true (T) or false (F)