Which is not a hypothesis that attempts to explain the latitudinal diversity gradient?
A. Species in tropical habitats have had
longer to evolve and diversify.
B. Temperate communities have fewer
species due to the need to adapt to a wider
range of weather conditions.
C. Tropical areas have larger population
sizes for a given species.
D. A given species in tropical habitats may be
more spread out, leaving room in between for
others.
E. Tropical areas generally have more
parasites that may attack particular types of
trees, thereby affecting their distribution.
C
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You are studying a biochemical pathway. Preliminary results suggest that this pathway is subject to end-product repression. This pathway is therefore most likely to be a(n) ________ pathway.
A) anabolic B) catabolic C) constitutive D) induced E) unregulated
DNA is different from RNA in that
A) RNA contains an additional oxygen atom on the ribose sugar. B) RNA is made up five bases, whereas DNA is made up of four. C) RNA cannot exist as a double helix. D) in general, RNA molecules are longer than DNA molecules. E) All of these statements are true.
A stationary population pyramid:
b. reflects data for only one sex as opposed to both. c. has the shape of an inverted pyramid. d. reflects unchanging birth and death rate patterns. e. is a common shape for developing countries.
Where may halophilic Archaea be found?
a. salt lakes b. soda lakes c. salted pork d. all of the above