Prokaryotes are the ancestors of
a. protists.
b. fungi.
c. plants.
d. animals.
e. all of these.
E
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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.
Members of the Enterobacteriaceae produce toxins known as (enterotoxins/hemolysins/siderophores) to capture iron for their use
What will be an ideal response?
Which statement is true? a. Environmental factors can affect gene expression, which will always affect the genotype
b. Environmental factors can affect gene expression, which will affect the phenotype. c. Environmental factors never affect gene expression, which will never affect the phenotype. d. None of these choices. e. Environmental factors can affect gene expression, which will never affect the genotype.
Coxiella burnetii is responsible for ________.
A. Typhoid fever B. Q-fever C. Rocky Mountain spotted fever D. Lyme disease