What is the hypothetical result of different mutations accumulating in different populations?
A. the evolution of different species
B. the extinction of one population
C. merging the populations through migration
D. fixation of the same alleles in both
populations
E. decreased genetic isolation
A
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Some methanogenic Archaea are capable of fixing nitrogen.
Answer the following statement true (T) or false (F)
Which of the following will cause a shift in the hemoglobin-oxygen dissociation curve to the right?
A) increase in temperature only B) increase in plasma pH only C) increase in 2,3-BPG (2,3-bisphosphoglycerate) only D) both an increase in temperature and an increase in 2,3-BPG E) both an increase in temperature and an increase in plasma pH
Which of the following is a weakness of the biological species concept?
A. It relies on the subjective judgment of experts to decide whether populations are similar enough to be the same species. B. It requires phylogenetic trees, which haven't been estimated yet for many lineages. C. It is not applicable to sexually reproducing species because the offspring are genetically distinct from the parents. D. It isn't applicable to asexual, fossil, or geographically isolated species.
Which of the following would be most affected by a mutation that prevented cells from forming tight junctions?
A) attachment of cells to the surrounding matrix B) direct flow of water and small molecules from one cell to another C) integrity of the inner lining of the digestive tract D) attachment of the cytoskeleton to the inside of the plasma membrane