Synthesis of a repressible enzyme is stopped by the
A) allosteric transition.
B) substrate binding to the repressor.
C) corepressor binding to the operator.
D) corepressor-repressor complex binding to the operator.
E) end product binding to the promoter.
D
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The compound 2,4,5-trichlorophenoxyacetic acid is a synthetic auxin that is used as an herbicide. It is applied by spraying it on the plant
After spraying with synthetic auxin, the plant undergoes a short period of what appears to be rapid growth and then wilts and dies. Which of the following statements could explain how a synthetic auxin kills weeds? A. The herbicide causes the leaves to grow quickly. More photosynthesis occurs, but the increase in sugar production blocks phloem vessels and the plant dies. B. The plant grows so rapidly that the cellular integrity of the plant is destroyed (i.e., cell walls break down), damaging transport systems within the plant. C. Spraying the plant clogs the stomata, so photosynthesis can no longer occur. D. The synthetic auxin cannot move through PIN channels, thus destroying the natural auxin concentration gradient and inhibiting growth.
Which of the following is NOT a descendent
of stem reptiles?
a. mammals b. birds c. snakes d. fish e. all of these are descendents of stem reptiles
Is the average ecological footprint getting larger or smaller globally? What will be an ideal response?
All EXCEPT which of the following are significant
routes for water loss from the body? a. excretion in urine b. sneezing c. sweating d. elimination in feces e. evaporation from respiratory surfaces