Only mammals and birds can produce urine that is
A. hypertonic.
B. isotonic.
C. hypotonic.
Answer: A
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What is the process that plants use in order to lock carbon into their tissues?
a. Cellular respiration b. Photorespiration c. Photolysis d. Electron transport e. Photosynthesis
What word below is used to describe extracellular messenger molecules that bind to receptors at the extracellular surface of the responding cell?
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Meselson and Stahl grew cells in media that contained different isotopes of nitrogen (15N and 14N) so that the DNA molecules produced from these different isotopes could be distinguished by mass
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