The differentiation of embryonic stem cells into neurons and glial cells is a consequence of which type of cell signaling?
A. juxtacrine
B. paracrine
C. autocrine
D. endocrine
E. All of these choices are correct.
A
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One important difference between the C, N, and S cycles and the P, Ca, and Si cycles is that
A) P, Ca, and Si are NOT cycled in terrestrial environments. B) the P, Ca, and Si cycles do NOT involve redox changes or gaseous forms that can alter Earth's atmospheric chemistry. C) the P, Ca, and Si cycles do NOT involve microbial activity. D) the P, Ca, and Si cycles are NOT affected by global warming or other human activity.
In Barrow, Alaska, the sun does not set for several months in the summer. Based on what you know about photoperiodism, what type of plant is most likely to flower during the summer in Barrow?
A. Long-day plants. B. Short-day plants. C. Day-neutral plants.
each cell runs on chemical energy mainly found in ___________________.
Fill in the blank(s) with the appropriate word(s).
A patient with kidney or liver failure would MOST likely develop:
A) severe dehydration. B) an increase in isotonic fluid. C) cellular shrinkage and death. D) excessive hypertonic fluid levels.