Experiments by Steve Tanner and colleagues (2000 ) with gray tree frogs demonstrated that female frogs preferentially mated with male frogs exhibiting ________
A) many short, repetitive calls over single long calls
B) longer calls rather than shorter calls
C) larger body size over small body size
D) louder calls over softer calls
E) trilling calls over constant calls
B
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In reproductive cloning, when a clone grows from a single cell to a full organism, the development happens through ________.
A. mitosis B. cloning C. surrogate growth D. meiosis
What important feature(s) of noncovalent bonds makes them so important to life?
A. They are strong bonds that hold atoms together tightly in cells. B. They are weak in a cellular environment so they can be made, broken, and reformed easily. C. They can only occur in cells. D. Both a & c. E. Both b & c.
Refer to the accompanying figure. Antidiuretic hormone has its effects along the region labeled as:
a. 6. b. 7. c. 8. d. 9. e. 10.
Sodium ions are single atoms. Why can't they simply diffuse through the cell membrane's lipid bilayer?
A. Chelator proteins capture any ions that start to cross the bilayer. B. Since they are charged, ions can't cross the hydrophobic center of the membrane without a channel or pump. C. Ions do traverse the membrane easily, but the sodium-potassium pump moves them back across. D. Sodium ions are covalently attached in groups of three, which are too large to diffuse easily.