The hypothalamus and pituitary link the activities of the endocrine system and nervous system by
a. neurohormones being secreted in response to the summation of neural messages that enter
the hypothalamus.
b. shifts in hormonal concentrations being detected by the anterior pituitary.
c. pheromones being secreted as a response to photoperiodic stimuli.
d. the nervous tissue of the anterior lobe of the pituitary sending stimuli to the glandular
tissue of the posterior pituitary to produce hormones that will be secreted by the
hypothalamus.
e. direct neural connections.
A
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As a result of the way nerve impulses are propagated, they are unidirectional. Which of the following does not contribute to this phenomenon?
A) The time interval encompassed by the refractory period does not allow the impulse to travel in reverse. B) Presynaptic neurotransmitters and postsynaptic receptors are separated. C) Unidirectional sodium and potassium channels open only toward the axon of the nerve cell. D) Sensory processes are oriented in such a manner that the information is targeted to the dendrites of the nerve cell. E) none of the above
In the accompanying figure, why does the curve sharply drop after approximately 45°C instead of mirroring the slope
of the line going from 0-40°C?
a. At high temperatures, the reactions proceed so quickly that enzymes are no longer helpful or required. b. This is true of all catalysts and is not due to any special features of enzymes.
c. The kinetic energy of the reactants is so great that it destabilizes the enzyme and diminishes the enzyme's activity. d. The kinetic energy of the reactants is lower than that of the products, forcing a change in enzyme activity. e. The enzyme begins to denature above a certain temperature, eliminating all catalytic activity of the protein.
cDNA is copied from
A) DNA. B) protein. C) mRNA. D) a pictogram.
A mutation in which part of a chromosome is transferred to a non-homologous chromosome is referred to as:
a. deletion. b. inversion. c. translocation. d. fission. e. fusion.