If water is not reabsorbed in the colon:
A) diarrhea occurs.
B) constipation occurs.
C) the appendix may rupture.
D) waste material is solidified.
Answer: A) diarrhea occurs.
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Two groups of your colleagues are arguing over the amount of energy required for a beaker full of Substance X to complete an endergonic reaction. The first group insists that only the activation energy for a single reaction is necessary, which will release at least enough energy to start a second and third reaction, until all the reactants are consumed. The second group strongly disagrees, insisting that the energy required is equal to the activation energy of a single set of reactants, multiplied by the number of reactant sets in that volume of Substance X. Which group is correct?
a. Group 1 is correct, if and only if the energy released by each set of reactants is sufficient to activate a secondary reaction, after accounting for entropy. b. Group 2 is correct; the amount of energy required must equal the activation energy of all of the reactants in the beaker of Substance X. c. Group 2 is half right; endergonic reactions absorb energy, so free energy, activation energy, and entropy losses for all reactants must be included. d. Neither group is correct; endergonic reactions occur spontaneously, and the reaction has likely been completed unnoticed during this argument.
The cell wall
a. provides physical support for plant cells. b. controls the transport of materials out of the cell. c. replaces the plasma membrane in plant cells. d. is found in all eukaryotes. e. prevents the transport of toxic substances into the plant cells
In glycolysis, fructose-1, 6-bisphosphate splits, forming two molecules of:
a. ADP. b. citric acid. c. G3P. d. glucose. e. acetyl CoA.
What does phototaxis allow the cell to do?
a. stay in the optimum light environment b. stay in the optimum magnetic environment c. stay in the optimum chemical environment d. stay in the optimum climate environment