Describe the pathogenesis of HIV to explain how the number of CD4 lymphocytes decline in an ongoing HIV infection
What will be an ideal response?
Answer: HIV commonly infects macrophages first, then targets TH cells. After HIV has infected macrophages, a different HIV gp120 protein is made that binds to the CXCR4 chemokine receptor on T cells. A T cell, once infected with HIV, can fuse with up to 50 other uninfected T cells, called syncytia, which results in the loss of immune function and eventually cell death.
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A large lateral spine is characteristic of which Schistosoma egg?
a. Schistosoma mansoni b. Schistosoma japonicum c. S. haematobium d. Schistosoma mekongi
What sensory modalities are used by the message receivers in honeybee waggle dance communication? (Check all that apply.)
_____ auditory _____ autonomic _____ chemosensory _____ proprioceptive _____ visual 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 the waggle dance in bees? 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? Reflection 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 phospholipids interact with water molecules?
A) The polar heads avoid water; the nonpolar tails attract water (because water is polar and opposites attract). B) Phospholipids do not interact with water because water is polar and lipids are nonpolar. C) The polar heads interact with water; the nonpolar tails do not. D) Phospholipids dissolve in water.
Macrophages are derived from circulating leukocytes called
A. Neutrophils B. Monocytes C. Lymphocytes D. Kupffer cells E. Dendritic cells