Rapid inward diffusion of Na+ produces a dramatic change in membrane potential. What is this event called?
A. Depolarization
B. Excitatory postsynaptic potential
C. Saltatory conduction
D. Monosynaptic reflex
E. Hyperpolarization
Answer: A
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Why isn't the oxygenase function of rubisco active under normal environmental conditions?
a. the oxygenase activity of the enzyme requires more energy b. the affinity of the enzyme favors the binding of CO2 c. the oxygenase activity of the enzyme is inhibited by O2 d. the binding site of the enzyme is allosterically inhibited under normal conditions e. the oxygenase binding site has a higher affinity for ATP
All major animal lineages were present in the seas by the end of the ________ period
a. Cambrian b. Cretaceous c. Quaternary d. Carboniferous
_________ occurs when an intravenous injection of antibodies, bsuch as gamma globulin is administered to someone as a treatment. The serum used for emergency treatment of snakebites is an example of this type of immunity.
A) Artificial passive immunity. B) Artificial active immunity. C) Natural passive immunity. D) Natural active immunity. E) Artificial specific immunity.
Which of the following is true concerning postnatal development?
a. Infancy is defined as the first two years of life after birth. b. Senescence results in increased hormone secretion. c. Postnatal development occurs before birth. d. In general, boys experience their pre-adolescent growth spurt later than girls. e. Early childhood is a time of rapid cell division in nerve cells.