More than ____ percent of couples decide to terminate a Down syndrome pregnancy
a. ten
b. thirty
c. fifty
d. seventy
e. ninety
e
Biology & Microbiology
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A normal event in the process of blood clotting is the _____
A) production of erythropoietin B) conversion of fibrin to fibrinogen C) activation of prothrombin to thrombin D) increase in platelets E) synthesis of hemoglobin
Biology & Microbiology
The most common cancer in woman is cancer of the ____
a. blood b. skin c. colon d. lung e. breast
Biology & Microbiology
The source of the atmospheric oxygen necessary for the development of oxidative metabolism is thought to have been
a. glycolysis. b. the big bang. c. the breakdown of ATP. d. photosynthesis.
Biology & Microbiology
The basic unit of DNA structure is the
A) nitrogenous base. B) purine. C) pyrimidine. D) nucleotide
Biology & Microbiology