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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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

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