When geographic variation occurs among the members of a species, individuals
a. may be mistaken for separate species.
b. cannot mate successfully.
c. cannot produce offspring with intermediate characteristics.
d. may be absent in most locations.
e. may be from different subpopulations
A
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Which of the following is NOT a principle used when analyzing cladograms?
A. All species, or higher taxa, are placed on tips in a phylogenetic tree. B. All species, or higher taxa, are placed on nodes in a phylogenetic tree. C. Each cladogram branch point should have one or more shared derived characters that are common to all species above the branch point, unless the character is later modified. D. All shared derived characters appear together only once in a cladogram unless they arose independently during evolution more than once. E. All species, or higher taxa, are placed on tips in a phylogenetic tree and all shared derived characters appear together only once in a cladogram unless they arose independently during evolution more than once.
At which level is gene expression primarily regulated in prokaryotic organisms?
a. Transcriptional level b. Epigenetic level c. Post-translational level d. Translational level
People homozygous for a specific high-risk allele of thefto gene ____
a. tend to overeat b. store more fat c. are naturally heavier d. are always overweight e. cannot undergo gastric bypass surgery
A solution is at equilibrium across a plasma membrane. If 50 molecules were to enter the cell, how many molecules would need to exit the cell in order to maintain the equilibrium?
A . 50 B. 75 C. 25 D. 0 E. 100