Why would migration to an island by a single pair of birds be likely to lead to adaptive radiation in
their descendants?
What will be an ideal response?
Islands are often poor in species, with many unoccupied ecological niches, because relatively small
numbers of animals are capable of crossing large expanses of ocean.
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How can a mutation in a tumor-suppressor gene behave as a recessive allele at the cellular level, but appear as a dominant allele in pedigree analysis?
A) Some functional protein can still be produced in a cell heterozygous for a loss-of-function allele; however, an additional mutation can inactivate the second allele, eliminating all functional protein allowing cancer to occur in many family members. B) A single functional allele is sufficient to regulate the cell cycle, but not sufficient to promote apoptosis, allowing cancer to develop in every generation. C) A cell with half the amount of the functional tumor-suppressor protein can form benign tumors that will occur in every generation in the pedigree. D) Some functional protein can still be produced in a cell heterozygous for a loss-of-function allele; but loss-of-function tumor-suppressor alleles are so common in the population that many individuals are homozygous.
Animals store carbohydrates in the form of ____
a. glycogen b. starch c. glucose d. sucrose e. lipids
When a motor neuron transmits a message, it releases the neurotransmitter serotonin
____________________ Indicate whether the statement is true or false.
The form of nitrogen most likely to be absorbed from the soil by plants is
A. nitrous oxide gas. B. nitrogenous wastes. C. nitrogen gas. D. nitrite/nitrate ions. E. nucleic acids.