Activation of the enzyme phosphorylase b requires the transfer of a phosphate to which amino acid residue of the enzyme?
A) alanine
B) cysteine
C) serine
D) tryptophan
C
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Which plants have sperm that swim through the environment to reach the eggs?
A. mosses only B. mosses, ferns, and seed plants C. mosses and ferns D. seed plants only
Biomagnification is a process by which pollutant concentrations increase as food is passed up the food chain from lower trophic levels to higher ones
Indicate whether the statement is true or false.
The fundamental cause of weather is the
A) large heat capacity of water vapor. B) differing amounts of solar radiation at different places on Earth's surface. C) horizontal and vertical movements of air parcels. D) gain and loss of heat from the world's oceans. E) ability of carbon dioxide to absorb infrared radiation.
When did the first terrestrial plants appear on the land surface?
A) 400 million years ago B) 327 million years ago C) 225 million years ago D) 65 million years ago