Select the best response to the question. ?
?Why is it difficult to treat HIV infection?
A) The disease is difficult to diagnose.
B) The virus infects the cells of the immune system.
C) The disease produces very severe symptoms and is fatal.
D)There is only one drug that can be prescribed.
B
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Comparing DNA sequences to find evidence of a shared evolutionary history is called ________
A) genomics B) proteomics C) differential relatedness D) bioinformatics
Which examples would be considered different species under the biological species concept? Check all that apply.
A. Two plant species with no gene flow between them. B. Two bear species are able to breed in zoos, but have separate ranges in nature. C. Two tree species have different leaf shapes, but form hybrids in their overlapping ranges. D. Two skunk species look morphologically similar, but are unable to interbreed. E. Two snake species look different, but often form fertile hybrids.
Chemical elements that are needed to help form bodily structures and to facilitate chemical reactions in the body are ________
Fill in the blank(s) with correct word
In the human circulatory system, blood flows through the following structures in which order? (1) vena cava, (2) left ventricle, (3) pulmonary vein, (4) right atrium, (5) aorta, (6) pulmonary capillaries
a. 1 - 4 - 6 - 3 - 2 - 5 b. 1 - 5 - 3 - 6 - 2 - 4 c. 1 - 2 - 6 - 3 - 4 - 5 d. 1 - 4 - 3 - 6 - 2 - 5 e. 1 - 2 - 3 - 6 - 4 - 5