According to the American Cancer Society, 30% of all cancer deaths in the U.S. are due to ____
a. ultraviolet light exposure
b. automobile exhaust
c. industrial pollutan
d. pesticide and herbicide exposure
e. smoking
e
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An example of a hydrophyte flowering plant that can withstand and thrive under conditions of continued submergence is:
a. cordgrass. b. pickle weed. c. salt grass. d. turtle grass. e. blue grass.
Animals whose bodies are made up of three layers and have many structures in the middle layer are called
A. Triplobastic. B. Diploblastic. C. Jellyfish. D. Sponges.
In a nucleotide, the nitrogenous base is bonded to
A. an acid. B. a sugar. C. a phosphate. D. itself.
Because the two strands of a DNA molecule are ________ to each other, either one can be used as a template to reconstruct the other.
A. bound B. identical C. antiparallel D. complementary