In stimulus detection, sensory receptor cells convert a stimulus into a(n)
A) neurotransmitter.
B) enzyme.
C) electric signal.
D) astigmatism.
Answer: C
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How is the energy stored in a molecule of ATP used by the sodium-potassium pump protein?
A. It is used to transport potassium ions out of the cell. B. It is used to transport sodium ions into the cell. C. It is used to alter the conformation of the pump protein. D. All of the answer options are correct.
Who developed the individualistic model?
A. Daniel Simberloff B. Frederic Clements C. Henry Allan Gleason D. Joseph Connell E. E. O. Wilson
A positive direct ELISA result requires
A. one known antibody, one unknown antibody, and an unknown antigen. B. two known antibodies and one unknown antigen. C. two known antibodies and one known antigen. D. one known antibody, one unknown antibody, and a known antigen.
Why do you use only some of the variation of your treatment variable (the component predicted in the first stage) when using an instrumental variable approach?
A. To avoid the heteroscedasticity problem. B. To have the estimate of the treatment effect be based only on variation that is exogenous variation to the other factors affecting the outcome. C. To get smaller standard errors. D. To have the estimate of the treatment effect be based only on variation of the treatment that is correlated with the outcome.