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Which of the following is the best reason as to why increasing the NaCl concentration increases the temperature at which the two strands of DNA "melt" apart?
A) Greater NaCl concentration correlates to greater ion concentration. DNA is a poly-anion and therefore exhibits a strong attraction for ions. NaCl forms chains of ionic interactions that bridge the two strands of the DNA and thus causing the melting temperature of the DNA strands to increase.
B) Greater NaCl concentration results in molecular precipitation. The higher the degree of molecular precipitation the higher the melting temperature of the two DNA strands.
C) Greater NaCl concentration results in stronger cross-strand hydrogen bonds. Stronger cross-strand hydrogen bonds results in an increase in the melting temperature of the two strands.
D) Greater NaCl concentration correlates to greater negative charge neutralization (shielding). Greater negative charge shielding reduces cross strand repulsion and thus increases the melting temperature of the two strands.
What are the principal natural sources of hydrogen? What are the principal methods for the commercial preparation of hydrogen?
A process involves the performance of electrical work in the amount w' on a system. Show that if the process is carried out at constant volume, the heat absorbed is delta U-w'.
Acrylonitrile is an important building block for synthetic fibers and plastics. Over 2 billion pounds of acrylonitrile are produced in the United States each year. The compound is synthesized from propene in the following reaction
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an adult person radiates heat to the surroundings at about the same as a 100-watt electric incandescent lightbulb. what is the total amount of energy in kcal radiated to the surroundings by an adult in 24 hours?
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The fuel used in many disposable lighters is liquid butane C4H10 How many carbon atoms
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