Which of the following describes selective permeability?
a. Ions can only travel in certain directions across the membrane.
b. Only certain molecules are allowed to cross the membrane freely.
c. Only certain types of stimulation will result in an action potential.
d. All molecules must pass through designated channels.
b
You might also like to view...
By what physiological mechanism does moderate emotion improve memory storage? a. Emotional arousal releases hormones from the adrenal gland
b. Emotional arousal shifts most blood flow to the left hemisphere instead of the right. c. Emotional arousal increases the velocity of action potentials in the cortex. d. Emotional arousal causes the growth of new neurons in the cerebral cortex.
Which of the following is a disadvantage of the cross-sequential design?
a. participants often drop out of the study over time b. traveling is required c. participants become too old to study d. the results are only correlational
Which of the following statements about radiation exposure during pregnancy is true?
A) Low-level radiation from medical X-rays or industrial leakage is safe. B) Even low-level radiation can increase the risk of childhood cancer. C) The effects of radiation exposure are immediate and apparent. D) Radiation exposure affects physical development, but not cognitive or emotional development.
Geneticist Dr. Rubin N. Albertson is trying to run an independent samples t-test on two groups of mice. Both receive different gene therapies that attempt to extend their average life span. After examining the mean life span in each group, he found the distributions for both groups of mice were not normal, and in fact were very skewed. As a result he should:
a. Run a dependent samples t-test. b. Adjust ? to 0.05. c. Switch to a non-parametric test. d. Run an independent samples t-test.