Which of the following is not true of human immunodeficiency virus (HIV)?
A. It is the causative agent of acquired immune deficiency syndrome (AIDS).
B. It targets the B cells of the immune system.
C. It binds to the cell surface receptor CD4.
D. It kills many of the cells it infects but can integrate into the host genome.
E. It has the most error-prone of all reverse transcriptases, which results in a high mutation rate.
B
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If global temperatures increase, which biome will the Boundary Waters Canoe Area (BWCA) turn into?
A. tropical rainforest B. deciduous forest C. boreal forest D. short grass prairie E. tundra
What lineage of land plants arose before the bryophytes (mosses)?
A. Nonvascular plants B. Gymnosperms C. Angiosperms D. None of the above
What is a difference between embryonic and adult stem cells?
A) The use of embryonic stem cells raises fewer ethical issues than the use of adult stem cells. B) Embryonic stem cells are undifferentiated; adult stem cells are partially differentiated. C) It is easier to obtain embryonic stem cells. D) Adult stem cells are easier to grow in culture.
What does the first of Koch's postulates state?
a. The disease-causing organism must always be present in animals suffering from the disease but not in healthy animals. b. The isolated organism must cause the disease when inoculated into healthy, susceptible animals. c. The organism must be cultivated in a pure culture away from the animal body. d. The organism must be isolated from the newly infected animals and cultured again in the laboratory, after which it should be seen to be the same as the original organism.