Physical separation of a segment of a large population by a physical barrier that prevents gene flow can lead to __________
A) sympatric speciation
B) allopatric speciation
C) hybrid sterility
D) temporal isolation
E) gene flow
B
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The development of cauliflower and broccoli from wild cabbage is partly explained by
A. a mutation in a flower development gene that was artificially selected by humans. B. a mutation in a leaf development gene that evolved by natural selection. C. homoplastic convergence of two plant lineages. D. gene duplication and divergence, leading to novel functions. E. a mutation in a Hox gene that was artificially selected by humans.
Which cell structure will modify proteins made by the ribosomes?
a. Mitochondria b. Rough endoplasmic reticulum c. Golgi body d. Nucleus e. Plasma membrane
The smallest unit of life that can exist as a separate entity is a(n)
a. cell. b. molecule. c. organ. d. population. e. ecosystem.
Which one of the following is TRUE regarding erythropoietin?
A) It is secreted by the liver in response to rising blood pH. B) It causes the bladder to store increased amounts of urine. C) It is part of a positive feedback loop used to control the amount of hydrogen ion secreted by the kidneys. D) It stimulates the production of red blood cells in the bone marrow. E) It is secreted in response to rising blood oxygen levels.