How does an enzyme lower the energy of activation needed for a chemical reaction?
What will be an ideal response?
When substrates fit into the active site on an enzyme they are positioned correctly to react (either form bonds or break bonds). The active site can further orient the substrates helping them to reach the transition state. This takes less energy (lowers the energy of activation) than the substrates traveling at higher speeds in order to react.
Analyze and Evaluate the Concepts (Essay)
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A potential source of nitrogen in a sandy soil environment might be the bacterium, Rhizobium, which inhabits the root nodules of leguminous plants. Which of these statements is true, and should prevent Rhizobium or other root-inhabiting nitrogen-fixers from contributing nitrogen to the soil in this experiment?
A) Mosses have no roots. B) Moss gametophytes lack stomata. C) Mosses evolved before there were substantial amounts of nitrogen in Earth?s atmosphere. D) Among land plants, only legumes are known to establish symbiotic relationships with members of other kingdoms.
What type of survivorship curve is typical of many oyster species?
A. type I B. type II C. type III D. None of these are correct.
Epidemic typhus, spread by lice, is caused by
A) Chlamydophila pneumonia. B) Chlamydophila psittaci. C) Ehrlichia caffeensis. D) Rickettsia prowazekii. E) Rickettsia typhi.