Why are there not seven or eight levels to a trophic food chain?
A) lack of biodiversity
B) lack of global energy
C) lack of trophic efficiency
D) lack of primary productivity
C
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Eukaryotic cells compartmentalize some anabolic and catabolic pathways so that these pathways can be operated ________.
Fill in the blank(s) with the appropriate word(s).
Nestle is the world's largest packaged food manufacturer and Switzerland's largest company. How much of its revenue comes from Switzerland?
A) less than 2% B) about 20% C) around 50% D) over 80%
Fick's law states that:a
the amount of gas diffusing across a membrane depends on differences in partial pressure. b. the total pressure of a mixture of gases is the sum of the pressures of the individual gases. c. the dissociation of oxygen from hemoglobin depends on the pH of the environment. d. as oxygen concentration increases, there is an increase in the amount of hemoglobin produced. e. the size of an animal varies inversely to the amount of diffusion across its respiratory membranes.
Which of the following would be the best approach to allow a biologist studying the evolution of four similar species of birds to choose the correct phylogenetic tree from all possible phylogenetic hypotheses?
a. Constructing the tree that connects the species using the fewest number of branches b. Comparing the entire genomes of the species and arranging species within the phylogeny based on genome similarity c. Determining which species can interbreed and concluding that those that can evolved from a common ancestor most recently d. Choosing the tree that has the most evolutionary changes, as this would be the most likely scenario to produce four distinct species e. Constructing phylogenetic trees consistent with DNA sequence comparisons among the species and then choosing the tree that involves the fewest number of evolutionary changes from a common ancestor to the current species