Tissues of sharks are isotonic to seawater, but their concentrations of sodium ions, potassium ions, and chloride ions in cells and extracellular fluids are similar to those of freshwater fishes
What can you infer about the movement of sodium and chloride in these animals? A) To maintain homeostasis of sodium and chloride levels, the shark must take up additional sodium and chloride from seawater.
B) Sodium and chloride will diffuse into shark gills from seawater down their concentration gradient.
C) Sharks conserve sodium and chloride, limiting excretion.
D) Sodium and chloride must be eliminated through the gills.
B
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Suppose you use a match to ignite a sheet of paper from your notebook, and allow the fire to continue until the burning stops
If you could measure all the energy in the resulting ombustion products, and all the energy in the heat released (including whatever increase in disorder has occurred), would you predict this amount to be more than, less than, or the same amount as the amount of potential energy in the starting sheet of paper? (You should ignore the activation energy provided by the match to light the paper.) A. more energy than the paper B. less energy than the paper C. the same energy as the paper
The main form of glucose repression in the lac operon is
A. repression. B. the CAP/cAMP system. C. induction. D. inducer exclusion.
Which of the following is a genetic mutation that affects males more than females?
A. nearsightedness B. red-green color blindness C. farsightedness D. astigmatism E. blindness
AUG is the start codon and it codes for the amino acid___
Fill in the blank(s) with the appropriate word(s).