Base your answers to the questions below on the following information:
Using the patch clamp technique, a researcher measures a single channel in a membrane. The receptor channel passes 3 pA (picoamperes) of ionic current over a period of 8 msec at -60 mV; 1 pA = 10 -12 ampere.
Based on your knowledge of nerve transmission, this movement of ions will
A) stimulate a change in a postsynaptic membrane.
B) not stimulate a change in a postsynaptic membrane.
C) stimulate a change in a postsynaptic membrane if three channel events are combined.
D) stimulate a change in a postsynaptic membrane if 50 channel events are combined.
E) generate a current resulting in membrane depolarization.
B) not stimulate a change in a postsynaptic membrane.
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Gause’s experiments with Paramecium growing in
test tubes demonstrated that a. organisms with similar niches evolve enough to survive in different niches. b. organisms with slightly different nutritional requirements change to become exclusive competitors. c. organisms with similar nutritional requirements may compete to the point of extinction. d. organisms with slightly different nutritional requirements change to become exclusive competitors, and organisms with similar nutritional requirements may compete to the point of extinction. e. organisms with similar niches evolve enough to survive in different niches, and organisms with similar nutritional requirements may compete to the point of extinction.
Catecholamines are synthesized by the
A) adrenal gland. B) anterior pituitary gland. C) skeletal muscle. D) Schwann cells. E) hypothalamus.
Why did the F1 offspring of Mendel's classic pea cross always look like one of the two parental varieties?
A) No genes interacted to produce the parental phenotype. B) Each allele affected phenotypic expression. C) The traits blended together during fertilization. D) One allele was dominant.
In which example(s) below are models being used to make inferences?
a. A policeman clocking the speed of a motorist with a radar gun. b. Someone checks the weather forecast for the weekend. c. A conservation biologist uses population genetic models to design a captive breeding program. d. All of the above.