The movement of these blocks suggests that _____
A) during evolutionary time, these sequences have separated and have returned to their original positions
B) DNA sequences within these blocks have become increasingly divergent
C) sequences represented have duplicated at least three times
D) chromosomal translocations have moved blocks of sequences to other chromosomes
E) higher mammals have more convergence of gene sequences related in function
Answer: D
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The vision loss associated with glaucoma is most accurately explained by
A. detachment of the retina from the outer part of the eye. B. intraocular pressure buildup due to poor drainage of the aqueous humor. C. loss of photoreceptors in and around the fovea. D. protein accumulation in the lens. E. poor control of extraocular muscles.
A human gastrula is composed of three cell layers stacked on top of one another (like the layers of a sandwich). As the early cells within human embryos are incapable of migration, this tri-laminar disc is the result of mitotic cell division and not the active movement of cells.
a. true b. false
Two human activities, burning fossil fuels and ________, are important causes of the increase in atmospheric carbon dioxide
Fill in the blank(s) with correct word
Tuberculin skin testing
A) Will be positive in active TB. B) Will be positive if person has had previous exposure. C) All of these choices are correct. D) Injects PPD intradermally. E) Uses a purified protein filtrate of Mycobacterium tuberculosis.