If one phosphate is removed from ATP, the remaining molecule would be _____________
a. adenosine triphosphate
b. adenosine diphosphate
c. adenosine monophosphate
b
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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?
How do companion cells load most of the carbohydrates into sieve tube members?
a. by symport b. through carrier proteins c. through plasmodesmata d. by antiport
If plants originated from an organism like Chlamydomonas, then the origin of plants involved the loss of ________.
A. cell walls B. chloroplasts C. microtubules D. flagella
Which of the following is not true of seaweeds?
a. They are found in the red, green, and brown algal groups. b. They have true roots that anchor them tightly to withstand the turbulence of waves. c. They may be a source of food and commercial products. d. Most are classified as charophytes, the closest living relatives of land plants. e. They are multicellular photoautotrophs.