The microtubule behavior in which tubulin adds at the plus end, fluxes through a constant-length microtubule, and comes off the minus end is called
a. an equilibrium state.
b. dynamic instability.
c. treadmilling.
d. recycling.
e. directional transport.
Ans: c. treadmilling.
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Yogurt contains galactose and glucose, which are generated when bacterial enzymes act on milk sugars. What is the main source of the galactose in yogurt?
A. Maltose B. Sucrose C. Lactose D. Fructose E. Glycogen
The following graph shows the relationship between extinction and habitat area. Which statements help explain the trend shown on the graph? Check all that apply. 
A. Larger patches are likely to have a more uniform habitat. B. Species richness is higher on larger patches. C. Larger patch size reduces genetic drift. D. Larger patches are more likely to be encountered by new immigrants. E. Larger patches are more geographically isolated than smaller patches.
The complementary base pairs in a DNA molecule are stabilized by:
A) ionic bonds. B) a salt bridge. C) hydrogen bonds. D) covalent bonds. E) the electrostatic interactions of the charged backbone
All of the RNAs
A. are translated into proteins. B. can be found in the ribosomes. C. are transcribed from DNA. D. interact with amino acids. E. function within the nucleus.