One of the most common of all childhood cancers is ____
a. Wilms tumor
b. cystitis
c. glomerulonephritis
d. adenocarcinoma
e. pyelonephritis
ANSWER: a
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Studies have shown that in the flowering plant Arabidopsis the root-shoot axis is established ____
a. by the first cell division of the embryo b. within hours after the seed germinates c. during the torpedo stage of embryonic development d. shortly after the eight-cell embryo stage e. by plant tissues breaking through the seed coat and making contact with soil
The primary cells of the immune response are the T and B cells. T and B cells are types of:
A. natural killer cells B. antigens C. phagocytes D. lymphocytes
Which organelles contain DNA?
a. lysosomes and ribosomes b. lysosomes and mitochondria c. chloroplasts and mitochondria d. chloroplasts and ribosomes
Archaea and bacteria diverged:
a. before archaea and eukarya diverged. b. after archaea and eukarya diverged. c. when archaea and eukarya diverged. d. after bacteria and eukarya diverged. e. before bacteria and eukarya diverged.