Four of the following explain the area effect on island diversity. Which one is the exception?
a. Larger islands have more habitats.
b. Smaller islands have more varied and higher elevations.
c. Larger islands intercept more colonizers.
d. Smaller islands have less complex topography.
e. Smaller islands have a greater probability of a species becoming extinct.
ANSWER: b
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Except for the regions at its tips where it is homologous to the X chromosome, genes on the Y chromosome:
A. are completely linked. B. are mostly completely linked, but a few exhibit independent assortment. C. are mostly completely linked, but a few exhibit random segregation. D. may or may not be linked; it just depends on how far apart they are from one another. E. may or may not be linked; it just depends on the individual alleles of the gene.
Respond to items 161–165 in reference to the four cell types
listed below. a. sensory neurons b. interneurons c. motor neurons d. Schwann cells M 161. cells that carry signals to muscle cells M 162. a type of neuroglia cell E 163. cells that form myelin E 164. cells that are restricted to the brain and spinal cord E 165. cells that pick up environmental signals
Each of the following bones is part of the axial skeleton EXCEPT which one?
A) ribs B) vertebrae C) sternum D) maxilla E) clavicle
Which phrase best describes the proton-motive force?
a. the amount of energy required to protonate a glucose molecule b. the force needed to move protons into the inner mitochondrial space c. the free energy associated with the removal of hydrogen from NADH d. the combination of a proton and voltage gradient across the membrane