The blastocyst attaches to the ________ about 6 days after fertilization and begins to digest its way inward
Fill in the blank(s) with correct word
endometrium
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Down syndrome results from which of the following chromosomal abnormalities?
a) a truncated copy of chromosome 3 b) all or part of a third copy of chromosome 21 c) translocation of genetic material on chromosome 21 d) the absence of a second copy of chromosome 10 e) two Y chromosomes
Which ecological problem might result from fertilizing a golf course with phosphorus-rich fertilizer?
A) poisoning of the grass caused by excess phosphorus B) heavy growth of algae and cyanobacteria in lakes and rivers caused by phosphorus runoff C) accumulation of toxic levels of phosphorus in animals in the vicinity, especially those higher on the food chain D) a slowdown in the weathering of rock that releases phosphates into the soil under natural conditions
Nondisjunction in somatic cells can result in aneuploid cells. This may give rise to:
A) cancer. B) cri-du-chat syndrome. C) Down syndrome. D) Turner syndrome. E) Klinefelter syndrome.
Which of the following is not correct concerning the plague?
A) Less than 10 cases per year occur in the U.S. B) Mice, voles, and other rodents are primary long-term reservoirs. C) Strains of the plague bacillus are less virulent today compared to strains prevalent in the Middle Ages. D) The etiological agent is Yersinia pestis. E) It is transmitted by flea vectors.