Critical Thinking Activities - Chapter 6 Answers

  1. The concentration of water was so low in the salt that water would move from the meat into the salt (132). Since bacteria, just as us, need water for life, they were unable to live off the meat and spoil it.

  2. The single molecule of glycogen, containing many molecules of glucose, still only counts as one molecule (133). If the liver stored glucose without combining it, it would swell and burst.

  3. Divide the cells into two equal groups. Kill all the members of one group by boiling (osmosis can occur in dead things (e.g. dialysis membrane 129) but active transport requires the energy provided by a living cell. Mix the substance with both groups and then pour the mixture through a filter. The live ones will be more brightly colored than the dead ones. Furthermore, examination through the microscope of the two groups will show the colored material inside the live cells but the solution around the living cells will have a low concentration of the chemical. The dead cells will show little or no coloration.

  4. The executioners are inducing hyperkalemia which will reduce the membrane potential and stop the heart (142).


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