The extracellular matrix
a. assists in the movement of substances across the plasma membrane.
b. prevents the loss of water when cells are placed in a hypertonic solution.
c. has numerous functions that affect the shape and activities of the cell that produced it.
d. contains the junctions that sometimes occur between cells.
e. All of these are correct.
c. has numerous functions that affect the shape and activities of the cell that produced it.
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Homo erectus has been shown to have dispersed from
A. Africa. B. Asia. C. South America. D. Europe. E. North America.
The ultimate source of all energy in a terrestrial ecosystem is
a. the organic matter in all the organisms of the ecosystem. b. water. c. sunlight. d. carbon dioxide. e. ATP.
Oocytes store mRNAs with _______ and activate them by _______.
a. no cap; addition of a cap b. long poly-A tails; shortening the tails c. short poly-A tails; lengthening the tails d. bound siRNA; removing the siRNA
When runoff containing excessive nutrients enters streams and lakes it can result in an overgrowth of cyanobacteria and algae, a process known as
A) eutrophication. B) oxidation. C) fixation. D) ammonification. E) both ammonification and fixation.