Which of the following are incorrectly paired?
a. heroin?premature births and low birth weight
b. thalidomide?babies born without toes
c. accutane?associated with malformations of the brain
d. cocaine?constricts fetal arteries, which leads to retarded development
e. cigarette smoking?an addiction to nicotine
e
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The endosymbiotic theory states that mitochondria originated from
A) a routine step in evolution. B) the fusion of several prokaryotes. C) purple bacteria entering and remaining in the cytoplasm of another cell. D) the slow evolution of various organelles over millions of years, particularly during the time of the dinosaurs. E) a long, intense period of lightning.
In mosses and fungi, the process of meiosis produces
A) egg cells. B) pollen nuclei. C) spores. D) sperm cells. E) prothalli.
Which activity may be helpful in reducing dependency on inorganic fertilizers?
A. Nitrogen fixation B. Composting C. Weathering D. Chlorosis E. Leaching
Most innate immune responses rely on
A. recognition of specific antigens. B. pathogens being engulfed and destroyed. C. plasma cells to secrete antibodies. D. IgM antibodies. E. clonal selection to replicate specific lymphocytes.