When Dr. Schmidt-Nielsen and his colleagues followed a "pulse" of 100% inhaled oxygen through the respiratory system of an ostrich, the oxygen pulse went to the
A. posterior air sacs to the lung and then to the anterior air sacs before being exhaled.
B. anterior air sacs to the lung and then to the posterior air sacs before being exhaled.
C. lung and then to the anterior air sacs and finally the posterior air sacs before being exhaled.
D. lung and then to the posterior air sacs and finally the anterior air sacs before being exhaled.
E. lung and then back out with exhalation—the air sacs were not involved.
A. posterior air sacs to the lung and then to the anterior air sacs before being exhaled.
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Understanding the role of telomerase has helped scientists understand the number of times a cell can divided. If scientists could control the telomerase activity in specific cells, they could potentially stop
A. the formation of cancer. B. aging of cells. C. All of the answer choices are correct. D. meiosis. E. aerobic respiration.
Which, if any, characteristics of bacterial gene transfer is/are useful in analyzing eukaryotic gene transfer?
What will be an ideal response?
Which feature is found in prokaryotic cells?
A) nucleus B) endoplasmic reticulum C) Golgi apparatus D) cell wall
What is the color of light that chlorophylls absorb that has the highest energy?
A. violet-blue B. yellow-orange C. red D. green