The conversion of T4 to T3 takes place in the presence of
a) 3'deiodinases
b) 5'deiodinases
c) 3 5'deiodinases
d) Thyroid deiodinases
e) None of the above
Ans: b) 5'deiodinases
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A key contribution to Darwin's thinking was the concept of limits put on the geometric growth of populations by nature, originally proposed by:
A. Charles Lyell. B. Karl Popper. C. Russel Wallace. D. Thomas Malthus. E. Peter Raven.
How does phosphorus enter the biological portion of the cycle?
a. Land plants take up dissolved phosphate from the soil water. b. Bacteria fix phosphate from the atmosphere. c. Consumers eat phosphate containing soil. d. Bacteria fix phosphate from water. e. Erosion of rocks moves phosphate into water, which consumers drink.
Which ancestors of modern humans migrated out of Africa to populate the rest of the world?
a. Homo habilis b. Homo erectus c. Neanderthals d. Cro-Magnon e. Homo sapiens
The sodium-potassium pump transports two Na+ out of the cell for every two K+ transported in
____________________ Indicate whether the statement is true or false.