During aerobic cellular respiration, oxygen consumed by homeothermic animals at 5oC is greater than the oxygen consumed at a higher temperature. This is most likely explained by which of the following statements?
A. The respiration rate is higher at 35oC; therefore the oxygen consumption is lower because less oxygen is necessary with the higher respiration rate.
B. The animals at 5oC were more active than the animals at 35oC; therefore more oxygen was consumed.
C. The animals at 5oC had lower metabolic rate than the animals at 35o
D. The respiration rate is higher at 5oC because the animal would need more energy to maintain their normal body temperature.
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During the investigation, the lights are turned off after 15 hours. What will occur to the dissolved oxygen concentration?
A. The dissolved oxygen concentration in both flasks will remain constant.
B. The dissolved oxygen concentration in the flask containing Elodea will be reduced.
C. The dissolved oxygen concentration in the flask containing Elodea will be increased.
D. The dissolved oxygen concentration in the control flask will be increased.
The student further investigated the dissolved oxygen concentration by varying the light intensity. Which of the following graphs most likely represent the data from his new investigation?
A
B
C
D
Based upon the results from his experiment, what was Engelman able to conclude regarding the relationship between the wavelength of light and the rate of photosynthesis?
A. The photosynthetic rate is highest at 500nm.
B. The photosynthetic rate is highest in blue light.
C. The photosynthetic rate is highest in red and violet light.
D. The photosynthetic rate is highest in 650nm.
Blue-green bacteria such as single-celled Gleocapsa and multicellular Nostoc contain chlorophyll arranged in nonmembranous layers inside their cells as shown above. Based on the diagrams shown above, what is a reasonalbe conclusion that can be reached about the relationship between the two structures represented?
A. The two stuctures evolved independently of one another.
B. It is likely that chloroplasts and blue-green bacteria are descended from a common ancestor.
C. Blue-green bacteria are free-living chloroplasts.
D. Chloroplasts evolved to be better blue-green bacteria.
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