Consider the phylogenetic distribution of documented fever responses displayed in the figure below. Does this pattern provide conclusive evidence for fever as an adaptation for fighting infections? Limit your answer to one to two sentences
What will be an ideal response?
ANS:
No, fever could simply be a side effect that accompanies bacterial infections, meaning that fever did not evolve as an adaptive response to infection.
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The organization of tissues in the accompanying figure is characteristic of a:
a. stem. b. spine. c. leaf blade. d. petiole. e. bud scale.
Read the following passage. Notice that there are numbers at the end of some of the sentences
Refer to these numbers when answering the question(s) below. Melanoma cells metastasize by leaving the primary tumor and entering the bloodstream, which carries them to distant parts of the body. The cancer cells leave the bloodstream by crossing the capillary basal lamina to enter another tissue (1). As a cancer researcher you think that somehow preventing the cancer cells from crossing the basal lamina of the blood vessels will inhibit metastasis (2). You believe that if you block the integrin receptors on the melanoma cells from binding to the extracellular matrix proteins of the basal lamina, then the cells will not be able to adhere to the basal lamina and therefore will not be able to migrate across it (3). You and your colleagues set about to make antibodies that will bind specifically to the integrins on the surface of the melanoma cells, preventing them from adhering to the proteins in the basal lamina. Once you have these integrin-specific antibodies, you test them on cancer cells in culture to see if they prevent the cells from crossing an artificial basal lamina. To do this, you and you colleagues set up nine cultures of cancer cells. You treat three cultures with the integrin-specific antibody. You treat three more cultures with a non-specific antibody that does not bind to integrins. Three cultures of cells are not treated with antibodies. (4). In the passage above, sentence number 2 is: A. support for their idea that blocking integrin function inhibits some tumor cells from binding the basal lamina. B. proof that their idea about blocking integrins will prevent metastasis. C. an observation. D. a prediction. E. a hypothesis.
What event causes the cervical curve to begin development?
A) walking begins B) intrauterine events C) an infant begins to lift his or her head D) the birth process E) None of the answers are correct.
This chapter discussed speciation by genetic divergence following geographic isolation, which is expected to lead to reduced gene flow, a process known as allopatric speciation
A more controversial form of speciation is the genetic divergence of populations without physical isolation, a process known as sympatric speciation. Can you envision a mechanism or process that would permit two coexisting populations of the same species to begin to diverge without being isolated from one another?