Which examples would be considered different species under the biological species concept? Check all that apply.
A. Two plant species with no gene flow between them.
B. Two bear species are able to breed in zoos, but have separate ranges in nature.
C. Two tree species have different leaf shapes, but form hybrids in their overlapping ranges.
D. Two skunk species look morphologically similar, but are unable to interbreed.
E. Two snake species look different, but often form fertile hybrids.
Answer: D
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If a living plant cell is placed in a beaker with a solution that has a ? value lower than the ? value of the plant cell, the
plant cell will ____.
a. take up water until it bursts b. lose water until its ? = ? of the solution c. take up water until within the cell ?P = ??S
d. take up water until its ? = ?S of the solution e. lose water until its ?S = its ?P
"N" is the elemental symbol for
A. nickel. B. nitrogen. C. neon. D. magnesium. E. copper.
What is the function of hemoglobin?
a. to transport nutrients b. to transport oxygen c. to transport carbon dioxide d. to transport oxygen and carbon dioxide e. to transport wastes
Transition mutations can result from ________.
A. a small insertion or deletion B. incorporation of a base analog that exhibits different base-pairing properties from the base it replaces C. incorporation of a base analog that exhibits different base-pairing properties from the base it replaces and chemical modification of an existing base in the DNA so that in the next round of replication it will pair differently from the unmodified base D. chemical modification of an existing base in the DNA so that in the next round of replication it will pair differently from the unmodified base