Why are action potentials usually conducted in one direction?
A) The nodes of Ranvier conduct potentials in one direction.
B) The brief refractory period prevents reopening of voltage-gated Na+ channels.
C) The axon hillock has a higher membrane potential than the terminals of the axon.
D) Voltage-gated channels for both Na+ and K+ open in only one direction.
B
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Meiosis typically results in the production of
a. two diploid cells. b. four diploid cells. c. four haploid cells. d. two haploid cells. e. one triploid cell.
Select the choices that are characteristics of hormones.
A. travel in the bloodstream B. affect metabolism of cells with receptors to them C. are secreted by exocrine glands D. can act at a distance between body parts
Differentiate between primary and secondary growth in plants. Be sure to include the results of each and where each
type of growth would be most likely to occur. What will be an ideal response?
Glycolysis involves 10 enzyme-catalyzed steps, that can be grouped into three phases: energy investment phase, cleavage phase, and the energy liberation phase.
Answer the following statement true (T) or false (F)