How does an enzyme work to catalyze a reaction?
A. It supplies the energy to speed up a reaction.
B. It lowers the energy barrier needed for reactants to achieve the transition state.
C. It lowers the energy of activation of a reaction
D. It supplies the energy to speed up a reaction and lowers the energy barrier needed for reactants to achieve the transition state.
E. It lowers the energy barrier needed for reactants to achieve the transition state or lowers the energy of activation of a reaction.
E. It lowers the energy barrier needed for reactants to achieve the transition state or lowers the energy of activation of a reaction.
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Dead Artemia cells that have been treated with trypan blue appear
(a) colorless. (b) blue. (c) red. (d) indistinguishable from living treated cells.
An extant organism is found to be almost
unchanged from its 200 million year old fossil. This is an example of: a. stasis. b. coevolution. c. mass extinction. d. adaptive radiation. e. none of these
If two populations of a species show significant structural differences, it is likely that
A. there is little sexual reproduction between populations. B. they are reproductively isolated. C. each is specifically adapted to a certain environmental situation. D. All of the choices are correct.
In the process of spermiogenesis, ______ become _______.
Fill in the blank(s) with the appropriate word(s).