Answer the following statements true (T) or false (F)
1. When Schmidt-Nielsen and his colleagues followed a "pulse" of air through the respiratory system of an ostrich, it took two full cycles of inhalation and exhalation for this pulse to pass through and be exhaled.
2. Chemoreceptors for oxygen normally play the most important role in regulating breathing rate.
3. Smaller mammals typically have higher ventilation rates than large mammals.
4. The shape of the oxygen-hemoglobin dissociation curve is a straight line.
5. Asthma attacks result from contraction of the muscles surrounding the bronchioles.
1. TRUE
2. FALSE
3. TRUE
4. FALSE
5. TRUE
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Which of the following lists gives the cellular processes for limb formation in correct order from first to last?
A. cell division, cell migration, cell differentiation, cell death B. cell migration, cell differentiation, cell division, cell death C. cell migration, cell division, cell differentiation, cell death D. cell division, cell differentiation, cell migration, cell death E. cell differentiation, cell migration, cell division, cell death
Answer the following statements true (T) or false (F)
1. A reason that some antibiotics harm bacteria but not humans is because these antibiotics inhibit enzymes only found in bacteria.
2.. Phagocytosis is a process that cells use to move large particles in through the cell membrane.
3. Receptor-mediated endocytosis is a specialized, more selective method of cell membrane transport than pinocytosis.
4. In addition to providing energy to the organism conducting photosynthesis, photosynthesis also provides raw materials and energy for heterotrophic organisms.
5. As this graph shows, photosynthesizing eukaryotes have several pigments and accessory pigments that selectively capture the green wavelengths of photons for photosynthesis.
In the cell cycle, the G1 phase represents ____
a. the stage of DNA synthesis b. splitting of the chromosomes into chromatids c. a period of growth d. the stage of actual cell division e. the stage just prior to meiosis
A researcher suspects that the food in an ecosystem has been contaminated with radioactive phosphates over a period of months. Which of the following substances could be examined for radioactive phosphate to test the hypothesis?
A) the amino acids within proteins produced by organisms living in the area B) the starch produced by plants in the area C) the DNA of the organisms in the area D) All of the above are true.