Explain how the impact of a large comet may have caused the extinction of the dinosaurs
What will be an ideal response?
Sixty-five million years ago, at the end of the Cretaceous period, over 75 percent of the species on
Earth, including the dinosaurs, became extinct. Scientists have found a thin layer of clay all over the world that was laid down at that time, and it is rich in the element iridium—common in meteorites but rare in Earth's crust. This suggests that an impact occurred that was large enough to have altered Earth's climate and caused the worldwide extinction.
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Which regulatory mechanism does NOT depend on a conformational change in protein/enzyme structure to change activity?
A) attenuation B) catabolite repression C) feedback inhibition D) negative control
If the equilibrium potential is close to the resting membrane potential, the net ionic movement across the membrane
will be very small.
Indicate whether the statement is true or false.What type of ecological relationship exists between Humboldtia brunonis and Technomyrmex albipes, described in Investigating Life 22.5?
A. mutualism B. predation C. parasitism D. commensalism E. competition
Macromolecules are broken down to monomers in ________
A. dehydration reactions. B. anabolic reactions. C. hydrolysis reactions. D. denaturation reactions.