How do sensory cells communicate different types of information to the brain—touch versus light for example?
A. by firing action potentials at different frequencies in the same neuron
B. by firing action potentials of varying amplitudes in the same neuron
C. by using different neurons for different stimuli (e.g., light and touch)
D. by using different kinds of electrical signals in the same neuron as the information is conveyed to the brain
E. by using different kinds of receptor potentials in the same neuron
C. by using different neurons for different stimuli (e.g., light and touch)
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Why would bacteria evolve so that the presence of tryptophan inhibits its own production?
A. Producing the enzymes that synthesize tryptophan is metabolically expensive, so it is wasteful to make them when tryptophan levels are high and its synthesis is not necessary. B. Producing high levels of tryptophan inhibits the production of other amino acids, so inhibiting its production allows all amino acids to be synthesized at equal concentrations. C. High levels of tryptophan causes cells to become unresponsive to external stimuli, so its production must be regulated. D. High levels of tryptophan inhibit cellular respiration and the synthesis of ATP, so its production must be regulated. E. All of these choices are TRUE
Which endocrine gland is the main center for control of the internal environment?
a. pineal b. hypothalamus c. thyroid d. adrenal cortex e. thalamus
If Sry protein were injected into a genetic female fetus 6 weeks after conception, the fetus would develop into a genetic
a. female with ovaries. b. female with testes. c. female with neither testes nor ovaries. d. male with ovaries.
The lowest layer of the atmosphere, from sea level to about 7.4 miles, is the:
A) troposphere. B) ionosphere. C) stratosphere. D) ozone layer.