Free radicals are considered dangerous because they
A) damage oxygen and cause it to become an antioxidant.
B) emit dangerous radiation.
C) attack the atomic nucleus.
D) steal electrons from other atoms, causing those atoms to become unstable.
D
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Assume that in guinea pigs, dark brown fur (B) is dominant to black fur (b). If you mate a homozygous black guinea pig with a heterozygous brown guinea pig, what proportion of the progeny will be black?
A) none B) 1/4 C) 1/2 D) 3/4 E) all
Four of the five plants listed below have
flagellated sperm. Select the EXCEPTION.
a. mosses b. horsetails c. ginkgos d. conifers e. ferns
Maria, a volunteer firefighter in New Jersey, rushed along with the rest of her fire company to lower Manhattan on that awful morning of September 11, 2001
As they crossed over the Hudson into the city, they heard that the towers had collapsed, so they helped search through the rubble and dust from the buildings to find survivors. Maria has now developed serious health problems based on her exposure to the rubble and dust, which included asbestos and many other small particles. Which organ system and which organelle do you think are most likely failing in this brave woman's body?
The pathogenicity of primary tuberculosis is due to the fact that the mycobacteria
A) are not phagocytized. B) prevent fusion of lysosomes with vesicles. C) form a pseudomembrane. D) destroy helper T cells. E) are carried by macrophages to a variety of sites.