Which type of chromosomal change occurs when a part of a sequence becomes oriented in the reverse direction?
a. Translocation
b. Duplication
c. Inversion
d. Deletion
e. None of these choices.
c
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Determine the rate of diffusion in the gas-exchange organ of an air-breathing animal where the area for gas exchange in the lung is 200 mm2,
the diffusion constant is 0.08, the (partial pressure of oxygen) of the air in the lung is 140 mm Hg, the in blood flowing into the lung is 90 mmHg, and the thickness of the gas exchange membrane is 0.001 mm. A) 800,000 B) 125 C) 00032 D) 10,000,000
Which of the following is not true of viroids?
A. Viroid RNA does not serve as mRNA nor does it direct the synthesis of mRNA. B. Viroids are small circular ssRNA molecules. C. Viroids have no protein capsids. D. Extracellular viroids have a lipid bilayer envelope.
What happens during interphase?
Which of the following groups has been planted extensively along U.S. streets because of their resistance to pollution?
A) Bryophytes B) Liverworts C) Cycads D) Ginkgos E) Conifers