What is the largest source of CO2 released into the atmosphere?
a. bacterial aerobic respiration
b. bacterial anaerobic respiration
c. fossil fuel combustion
d. syntrophic decomposition
Answer: A
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Oxygen has an atomic mass of 16 and an atomic number of 8 . How many neutrons are present?
A. 8 B. 16 C. 4 D. 24
What is the role of CREB in a white blood cell?
a. It is a tumor suppressor protein. b. It stimulates the activity of p53. c. It binds to CRE and activates cell division. d. It increases cAMP production during an infection. e. It decreases cAMP production during an infection.
The type of movement that is specific and requires carrier molecules and energy is
A. exocytosis. B. osmosis. C. endocytosis. D. active transport. E. facilitated diffusion.
The ocean
Select one: a. lacks life below the first several hundred feet. b. has zooplankton but not phytoplankton. c. covers little of the Earth's surface. d. is not affected by freshwater pollution. e. covers three-fourths of the planet.