The level of carbon dioxide in the blood is monitored by nerve tissue. If you exercise strenuously, the increase in cellular respiration consumes oxygen from the blood and produces surplus carbon dioxide removed in the blood. Since this physical exertion requires faster breathing to replenish oxygen supplies and carry away carbon dioxide, the carbon dioxide sensors result in signals from the brain to increase breathing rate. After you have rested, and carbon dioxide levels are back to normal, your breathing rate decreases too. This is an example of
A. a positive feedback loop that stimulates a response opposite to the stimulus.
B. a response to a sensory impulse that causes a muscle or gland to react.
C. the dynamic interplay between events that tend to change the internal environment and events that tend to keep it the same.
D. a negative feedback loop that stimulates a response similar to the stimulus.
E. the dynamic interplay between events that tend to change the internal environment and events that tend to increase the changes.
Answer: C
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The first phase of glycolysis requires the input of two ATP molecules. It is therefore:
A. endergonic. B. exergonic. C. oxidative. D. reducing. E. None of the answer options is correct.
What causes a disclimax community?
a. primary succession b. secondary succession c. facilitation d. inhibition e. disturbance inhibiting successional change
Which of the following is not one of the distinctive features of dinoflagellates?
A. They are photosynthetic. B. Some exist in fresh water, while some are part of marine plankton. C. They form large, spherical colonies. D. They are unicellular. E. Some planktonic members are luminous and cause flashes in the night.
Which of the following provides some evidence that RNA probably evolved before DNA?
A. DNA polymerase has proofreading function. B. RNA polymerase makes a single-stranded molecule. C. RNA polymerase uses DNA as a template. D. RNA polymerase does not require localized unwinding of the DNA. E. DNA polymerase uses primer, usually made of RNA.