The greatest metabolic advantage of a fish's two-chambered heart is
A. its ability to stay full of blood even as it is emptying into the conus arteriosus.
B. its ability to pump blood to the gills for gas exchange before the blood is pumped to the remaining areas of the body.
C. its ability to pump blood under high pressure to all areas of the fish's body.
D. its ability to keep oxygen-rich blood in one chamber separate from oxygen-poor blood in the other chamber.
E. its ability to maintain a constant blood pressure in the fish.
Answer: B
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You expose a tube of bacteria to ultraviolet radiation to induce mutations. You then spread the bacteria on a plate containing media with all known required nutrients and wait until separate colonies form. Finally, you use replicate plating to transfer a print of this plate to an additional sterile plate containing minimal media plus a known required nutrient for the bacteria. Based on this protocol, colonies growing on the plate with minimal media would include what type of cells?
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