The first primitive cells probably came into being
A. in the ocean.
B. in the early oxidizing atmosphere.
C. on land.
D. in volcanoes.
A. in the ocean.
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Cyanobacteria, milkweed plants, and oak trees are all considered:
A. primary producers. B. primary consumers. C. secondary consumers. D. tertiary consumers. E. decomposers.
What is one problem associated with using retroviruses as human gene therapy vectors?
A) Their random integration into the host chromosome may result in detrimental mutations. B) They need to integrate through an RNA intermediate. C) The level of proteins produced from them is usually very low. D) The level of proteins produced from them is usually very high.
Why is the use of angiogenesis inhibitors less likely to have adverse side effects when used to treat cancers?
a) Angiogenesis inhibitors target normal, genetically stable, endothelial cells, which continue to respond to the presence of these agents. b) Angiogenesis inhibitors have low affinity for blood vessels. c) Angiogenesis inhibitors are unstable and do not survive long enough to induce resistance. d) Angiogenesis inhibitors are stable and survive too long to induce resistance.
Maturation of stem cells into mature blood cells occurs in the red bone marrow
Indicate whether the statement is true or false