What is a possible reason for oxygen to be so low by the end of the night?
A) Algae produce oxygen as a by-product of photosynthesis mostly during the day, and not at night.
B) Fish consume oxygen during the night, and oxygen starts to run out by dawn.
C) Both of these explain the low level of oxygen
D) Neither of these explains the low level of oxygen
C
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Which of the following reactions prevails in red blood cells traveling through alveolar capillaries? (Hb = hemoglobin)
A) Hb + 4 O2 ? Hb(O2)4 B) Hb(O2)4 ? Hb + 4 O2 C) CO2 + H2O ? H2CO3 D) H2CO3 ? H+ + HCO3- E) Hb + 4 CO2 ? Hb(CO2)4
How does carbon buried in deep ocean sediments return back to the surface?
a. it floats to the surface b. it is brought up by fish c. storms stir up the ocean bottom d. wave motion brings it up e. uplifting of the sea floor
All of the following statements are true regarding mitosis and meiosis II EXCEPT:
A. The earliest eukaryotes were almost always single-celled and haploid, and they produced by mitosis. B. Mitosis evolved later, from meiosis. C. By mitosis and cytoplasmic division, one cell becomes two new cells. D. The outcomes of mitosis and meiosis differ. E. The molecular machinery of mitosis became remodeled into meiosis.
For each glucose molecule that enters glycolysis, how many times does the Krebs cycle turn?
A. One B. Two C. Three D. Four