Which of the following is true of the base content of DNA?
A) moles of adenine = moles of cytosine
B) moles of adenine = moles guanine
C) moles of adenine = moles of thymine
D) none of the above
C
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Why might increasing the concentration of a set of reactants increase the rate of reaction?
A. You have increased the ratio of reactants to products. B. You have increased the chances that any two reactant molecules will collide and react. C. The concentration of reactants is unrelated to the rate of reaction. D. The rate of reaction depends only on the mass of the atoms and therefore increases as you increase the mass of the reactants. E. none of the above
Two objects move toward each other because of gravity. As the objects get closer and closer, the force between them
A) increases. B) decreases. C) remains constant.
Feldspars ____
A)are only abundant deep in Earth's core B)never have a tetrahedral crystal structure C)are nonferromagnesian silicates D)are carbonate minerals E)have iron as a major element
Which revolution is most responsible for the shift from phase I to phase II in the process of demographic transition?
A) The Industrial Revolution B) The Green Revolution C) The Neolithic Revolution D) The Medical Revolution