You are working in a zoo, and unbeknownst to the zoo-keepers, a male lion sneaks into the pen of a female tiger, and months later, the female tigers gives birth to a liger. Lions and tigers do not co-exist in the wild, so ligers are not found naturally. This liger looks more like the father lion than the mother tiger because the lion genes tend to be more dominant, but it is larger than either the mother or the father. However, the liger is sterile, and so the only way to create more ligers is to continually breed male lions to female tigers. When the liger is presented to the scientific community, it is decided that the liger is not a new species. Upon which species concept is this decision based?
A. Biological species concept
B. Morphospecies concepts
C. Phylogenetic species concept
D. Sympatric species concept
Ans: A. Biological species concept
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Which of the following statements about diffusion is false?
A. It transports materials actively along a concentration gradient. B. It is effective only over small distances. C. It limits the size of prokaryotic cells. D. It limits the shape of prokaryotic cells. E. It supplies key molecules for metabolism.
A single-gene disease that can cause symptoms in a fetus is
A) Huntington disease. B) Alzheimer disease. C) malaria. D) osteogenesis imperfecta.
Birds belong to a related group of vertebrates that includes all of the
A) ray-finned fishes. B) amphibians. C) lobe-finned fishes. D) reptiles. E) mammals.
The tropics are known to have greater species diversity than the temperate zones.Which explanation for this phenomenon is the LEAST convincing?
A. Fewer predators in the tropics allow more prey species to flourish. B. Niches are narrower in the tropics. C. The tropics have greater plant production, which supports greater overall species richness. D. Seasonal variability is less in the tropics. E. Greater spatial heterogeneity in the tropics creates more niches.