You are studying a large tropical reptile that has a high and relatively stable body temperature. How would you determine whether this animal is an endotherm or an ectotherm?
A) You know from its high and stable body temperature that it must be an endotherm.
B) You know that it is an ectotherm because it is not a bird or mammal.
C) You subject this reptile to various temperatures in the lab and find that its body temperature and metabolic rate change with the ambient temperature. You conclude that it is an ectotherm.
D) You note that its environment has a high and stable temperature. Because its body temperature matches the environmental temperature, you conclude that it is an ectotherm.
C
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How could a paleontologist distinguish between a bryozoan fossil and a brachiopod fossil?
A. Bryozoans are large and solitary. B. Zoecia are always found in aggregates. C. You can only distinguish the two by examining the lophophore. D. Bryozoans often look like bivalves. 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 lophophorates? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
A J-curve is typical of a stable population
Indicate whether the statement is true or false
Which of the following statements about the classical pathway of complement activation is FALSE?
A) C1 is the first protein activated in the classical pathway. B) The C1 protein complex is initiated by antigen-antibody complexes. C) C3 is not involved in the classical pathway. D) Cleaved fragments of some of the proteins act to increase inflammation. E) C3b causes opsonization.
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. Low genetic diversity makes the MHC genes invariant, so the "transplanted" tissue is accepted as self. B. Marsupials lack an adaptive immune system. C. MHC genes are unique to humans. Without them, the T cells have no way to distinguish self and non-self. D. Tumors are never targeted by T cells, unless they are caused by a viral infection.