Why doesn't the gasoline in your car spontaneously ignite into flames? (The reaction of gasoline with oxygen is called
a combustion reaction, and is the reaction that is used to power your car).
a. The products of a combustion reaction have more energy than the reactants.
b. The gasoline in your car is in an air-tight container, so it cannot react with the oxygen from the air.
c. The amount of energy in the bonds of the products exceeds the amount of energy in the bonds of the reactants.
d. The reactants of the combustion of gasoline have less energy and the products.
e. The gasoline in your car alone cannot overcome the activation energy.
ANSWER: e
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A. Hfq B. MicF C. CAP D. None of the choices are correct.
The initial influx of sodium ions when an
action potential begins causes which of the following to follow?
a. a chain reaction in which more and more sodium channels open b. a chain reaction in which potassium channels open c. sodium channels rapidly close d. potassium channels rapidly close e. the cytoplasm becomes more negatively charged
What are the primary inspiratory muscles?
A) diaphragm and internal intercostals B) external and internal intercostals C) diaphragm and external intercostals D) diaphragm and the external and internal intercostals E) diaphragm and abdominal muscles
What type of species, if removed from the community, could lead to the collapse of the entire community?
A) Endemic species B) Keystone species C) Indicator species D) Flagship species