The cofactors required for enzyme activity often are
a. allosteric inhibitors.
b. allosteric activators.
c. charged amino acids.
d. large, complex organic molecules.
e. competitive inhibitors.
B
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Lichens are a mutualistic association of a fungus and either an alga or a cyanobacterium in which
A) the fungus protects the photosynthetic partner from erosion. B) the fungus slowly engulfs the photosynthetic partner. C) the fungus helps collect sunlight for the photosynthetic partner. D) the phototroph provides phosphorus to the fungus.
Which group can be distinguished from the other arthropods by its possession of two pairs of antennae?
a. insects b. millipedes c. chelicerates d. crustaceans e. trilobites
Which of the photographs in the above figure is an angiosperm?
a. A b. B c. C d. D e. both C and D
The distances between genes on a genetic map are measured in base pairs
a. True b. False