The type of speciation that results in the formation of separate species as a result of geographic isolation is called ________ speciation.
A. adaptive
B. allopatric
C. gradual
D. sexual
E. sympatric
Answer: B
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What human activity can cause flooding along riverbanks?
A) Removal of forests and wetlands along the river B) Decreased conversion of forests to farmland C) Decreased soil formation D) Overfishing E) Increased evaporation due to fewer trees
A primary reason that the kidneys have one of the highest metabolic rates of all body organs is that _____
A) they have membranes of varying permeability to water B) they operate an extensive set of active-transport ion pumps C) they are the body's only means of shedding excess nutrients D) they have an abundance of myogenic smooth muscle
Experiments have demonstrated that the "words" of the genetic code (the units that specify amino acids) are
A) single nucleotides. B) two-nucleotide sequences. C) three-nucleotide sequences. D) nucleotide sequences of various lengths.
What are telomeres and what is their major function?
What will be an ideal response?