In Connell's experiments with the barnacles Chthamalus stellatus and Semibalanus balanoides, the potential distribution of each species, in the absence of the other, is known as the
A. realized niche
B. competition zone.
C. fundamental niche.
D. tidal boundary.
E. idealized niche.
Answer: C
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When a crossover occurs within the inversion loop of a pericentric inversion, each recombinant chromatid will have (Select all that apply.)
A) a dicentric bridge. B) a duplication of some genes in the inverted region. C) a deletion of some genes in the inverted region. D) one copy of each gene, with some genes in a different order than normal. E) one copy of each gene in the normal order.
The graphs below show the frequency of the b+ allele over twenty generations in two populations of heterozygous
flour beetles (data for a population of ten individuals is shown in graph A; data for a population of one hundred individuals is shown in graph B). Why does the frequency of the b+ allele increase in both populations?
a. b+ is a lethal allele b. b+ is a balanced polymorphism c. b+ is a fixed allele d. the b+ allele is adaptive e. b+ is a neutral mutation
Evidence that all living cells have a common origin is best illustrated by the:a
basic similarities in cell structure and chemistry. b. fact that all new cells come from previously existing cells. c. cell theory, which states that the cell is the basic unit of life. d. fact that cells are the building blocks of the most complex plants. e. idea that cells are the smallest units that can carry out all life activities
Roughly speaking, (1) one gram of carbohydrate is the equivalent of how many Calories? (2) one gram of fat is the equivalent of how many Calories? (3) one gram of protein is the equivalent of how many Calories?
A. (1) = 4, (2) = 9, (3) = 4. B. (1) = 7, (2) = 9, (3) = 4. C. (1) = 4, (2) = 4, (3) = 4. D. (1) = 4, (2) = 10, (3) = 4.