Epinephrine
A. is an antihistamine.
B. causes desensitization.
C. inhibits the activity of lymphocytes.
D. reverses constriction of airways.
Answer: D
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An ?NH2 group is a(n) ____ group
a. carboxyl b. hydroxyl c. amine d. methyl e. carbonyl
Spore germination followed by cell divisions results in the production of
a. a sporophyte. b. an antheridium. c. a zygote. d. a gametophyte.
The accompanying figure shows the history of large meteorite impacts on both the earth and the moon. What is the graph's major implication for the origin of life on Earth?
A) Huge impacts make it unlikely that life arose and survived on Earth before about 3.8 billion years ago. B) Meteorites could not have brought the organic molecules that were necessary for life appear. C) The moon is considerably older than the Earth. D) Life must have originated on a different body in the solar system and been brought to Earth. E) The Oparin-Haldane model of life's origins applies to the moon as well as to the Earth.
Please match the cell types with the statements that most accurately describe them to test your understanding of prokaryotic cells, eukaryotic cells, and viruses.
Contains a nucleus and undergoes mitosis A) Prokaryotic cells B) Eukaryotic cells C) Viruses D) Both eukaryotic and prokaryotic cells E) Prokaryotic cells, eukaryotic cells and viruses