Which of the following statements is TRUE of small effector molecules?
A. Small effector molecules cause a conformational change in a regulatory protein.
B. Small effector molecules can prevent a repressor from binding a gene region.
C. Small effector molecules regulate gene transcription.
D. Small effector molecules regulate gene transcription by binding a regulatory protein.
E. All of the choices are correct.
D. Small effector molecules regulate gene transcription by binding a regulatory protein.
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In a temperate rain forest, primary productivity remains relatively constant
Indicate whether the statement is true or false
The membrane potential (resting potential) is largely set by the Na-K-ATpase pump.
a. true b. false
It has been argued that cutting old-growth forests and replacing them with plantations of young trees would help to alleviate the threat of global greenhouse warming. What important fact does this argument ignore?
A) Forests play too minor a role in global CO2 dynamics, which are affected far more by marine algae. B) Young trees fix carbon at a lower rate per unit mass than old trees. C) Most of the biomass of the cut trees would be added to the atmosphere as CO2 within a few years. D) Most of the young trees would die within a few years.
What was the first disease shown to be bacterial in origin?
A) yellow fever B) cholera C) anthrax D) malaria E) tuberculosis