Epinephrine is secreted by
a. pancreatic islet cells.
b. the thyroid gland.
c. the pituitary gland.
d. the adrenal medulla.
e. the adrenal cortex.
D
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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. An electrical current of 1 A is approximately 6 x 1018 electrical charges per second; how many ions pass through the channel when it is open? A) 144,000 ions B) 2400 ions C) 8,640,000 ions D) 8640 ions E) You cannot determine this from the information given.
A DNA similarity of 75% between two organisms
A. suggests the organisms are very closely related at the species level. B. suggests the organisms are not related. C. suggests the organisms may or may not be related. D. means the GC content is 45%.
Using the illustration below and the assumption that
half of a plant’s sperm and eggs are a and half are A, one can predict that the chance of sperm a meeting egg A at fertilization is a. 1/2 x 1/2. b. 25 percent. c. one out of four. d. 1/2. e. all of these EXCEPT 1/2.
The conducting tissue found in vascular plants that functions in transportation of materials throughout the plant, but does not lend structural support to the stem is
A. lycophyll. B. sporopollenin. C. xylem. D. phloem. E. endosperm.