Select the correct statement.
a. All action potentials are identical.
b. Some neurons have small action potentials and others have big action potentials.
c. Strong stimuli cause big action potentials and weak stimuli cause small action potentials.
d. No two action potentials are alike.
Answer: a. All action potentials are identical.
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Pleiotropy refers to:
A. the interaction of two genes affecting a single trait. B. the interaction of multiple genes affecting multiple traits. C. the interaction of multiple genes affecting a single trait. D. a single gene having multiple effects. E. two different norms of reaction for a single trait.
Transgenic crop plants are primarily developed for which of the following reasons?
a. To improve disease resistance b. To study patterns of inheritance c. To facilitate genetic testing d. To develop new vaccines
What condition develops when GABA levels in the brain are deficient?
A. epilepsy B. insomnia C. Huntington's disease D. Alzheimer's disease E. Parkinson's disease
Bird and mammal predators are more common in salt marshes during low tide than during high tide
Indicate whether the statement is true or false