If ATP production was regulated by positive feedback, then high levels of ATP in muscle cells would
A. stimulate more ATP production.
B. inhibit more ATP production.
C. not alter ATP production.
D. stimulate ATP degradation.
E. All of the answers for this question are correct.
A. stimulate more ATP production.
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A scientist is analyzing air bubbles trapped in ancient rocks that can be used to understand the ancient atmosphere. What do you expect the scientist will observe when comparing rocks younger than 3.8 billion years old to rocks older than 3.8 billion years?
A. The ratio of the carbon-12 isotope will be lower in the younger rocks, because living organisms preferentially use carbon-12 over other isotopes. B. The younger rocks will have higher levels of carbon dioxide, because there was no carbon dioxide in the atmosphere before animals evolved and expelled it as waste. C. The ratio of carbon-12 will be lower in the older rocks, because carbon-12 had to build up on earth before life could evolve. D. The amount of carbon will vary unpredictably in the younger rocks, because rock weathering added carbon dioxide to the atmosphere, and volcanic activity sequestered it.
The function of the torus in the walls of tracheids is
A. allowing the passage of water. B. stopping backflow of water. C. secretion of resin. D. sealing off air bubbles. E. allowing the escape of air.
Incompatibility in the Rh blood system can result in hemolytic disease of the newborn. Which combination poses the greatest risk?
a. Rh positive mother, Rh negative fetus b. Rh positive father, Rh negative fetus c. Rh negative mother, Rh positive fetus d. Rh negative mother, Rh negative fetus e. Rh positive mother, Rh negative father
Dioecious plants have
A. both male and female flowers. B. male or female flowers. C. only asexual reproduction. D. perfect flowers.