Referring to the figure above, the progression from Phase II HIV infection to Phase III is marked by
A) a high fever and swollen lymph nodes.
B) a drop in the helper T cell count to less than 200/mm3.
C) the complete absence of antibodies to HIV.
D) decreasing HIV in the blood.
E) helper T cell numbers recovering from an initial drop.
B
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Free nerve endings in the skin detect ____
a. steady touch b. steady pressure c. vibrations d. movements of individual hairs e. deep pressure
Which of the following is NOT a potential impact of ocean acidification?
A) Decreasing H+ concentrations B) Coral bleaching C) Changes in metabolism of marine animals D) Increasing carbonic acid concentrations
Choose the best definition of a community.
A. all of the organisms plus the nonliving habitat B. the dominant organisms in an area C. all of the organisms in an area D. living organisms and soil
Membrane synthesis in the cell requires the regulation of growth for both halves of the bilayer and the selective retention of certain types of lipids on one side or the other. Which group of enzymes accomplishes both of these tasks?
(a) flippases (b) phospholipases (c) convertases (d) glycosylases