Stomatal closure is passive because ______________
A. K+ and Cl- diffuse from high to low
concentration
B. water diffuses from low to high
concentration
C. ATP is required
D. it conserves leaf hydration
A
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Otto Loewi demonstrated that neurons transmit signals across synapses
a. by electrical signals. b. by Vagusstoff. c. by acetylcholine. d. by chemical signals. e. by proteins
A "nerve" is defined as:
a. neuron fibers bundled inside a sheath of connective tissue b. a single axon of a neuron c. the same as a neuron within the central nervous system d. a dendrite e. a fiber more than 10 inches in length
What do paleoanthropologists generally believe about genetic findings?
a. Genetic findings do not need corresponding fossil evidence to be true. b. Genetic findings need corresponding fossil evidence to be true. c. Genetic findings are nearly always incorrect. d. Genetic findings have no place in studying human evolution.
Which of the following causes the rapid change of membrane polarity during an action potential?
(A) Diffusion of neurotransmitters such as acetylcholine (B) Diffusion of positively charged ions across the cell membrane (C) Release of electrons from inside the cell (D) Release of protons from inside the cell