In attempting to construct a universal phylogeny, researchers analyzed several different gene sets. The results of this analysis are not congruent (see accompanying figure)
The most likely explanation for this, as proposed by Carl Woese and others, is ________ [three words] in early populations, which would account for these discrepancies. Fill in the blank(s) with correct word
horizontal/lateral gene transfer
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A molecular biologist is interested in purify a recombinant protein by His-tagging, but the protein and vector both lack histidine residues. In this case, the molecular biologist could use which of the following technique(s) to achieve purification?
A. Amplify the histidine-encoding sequence by PCR and add it to the gene of interest. B. Add a 6xHis-tag to the C-terminus of the protein. C. Add a series of histidine residues to the N-terminus of the protein. D. All of the choices are correct.
Vertebrates with external fertilization produce eggs that (select all correct choices):
A. have a yolk to provide nutrients to the developing embryo. B. obtain oxygen via diffusion from the environment. C. eliminate wastes via diffusion into the environment. D. obtain water via diffusion from the environment. E. are laid on or near substrates like rocks to
Gas exchange in arachnids takes place by tracheal tubes, ____, or both
a. gills b. mandibles c. book lungs d. metanephridia e. protonephridia
The human reproductive system is regulated by
A. restriction enzymes B. antigens C. complexcarbohydrates D. hormones