AP+Midterm+Review+09-10

AP+Midterm+Review+09-10 - AP BIOLOGY Midterm Exam Review...

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AP BIOLOGY Midterm Exam Review 2009-2010 Name: ______________________________ Section 1 Biochemistry MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter? A) oxygen, hydrogen, calcium, sodium B) carbon, sodium, chlorine, nitrogen C) carbon, oxygen, sulfur, calcium D) carbon, sulfur, phosphorus, hydrogen E) carbon, hydrogen, nitrogen, oxygen 2) A covalent bond is likely to be polar when A) the two atoms sharing electrons are different elements. B) one of the atoms sharing electrons is much more electronegative than the other atom. C) the two atoms sharing electrons are of the same element. D) the two atoms sharing electrons are equally electronegative. E) it is between two atoms that are both very strong electron acceptors. 3) Which of the following explains most specifically the attraction of water molecules to one another? A) polar covalent bond B) ionic bond C) hydrogen bond D) hydrophobic interaction E) nonpolar covalent bond 4) Which of the following best describes chemical equilibrium? A) Reactions stop only when all reactants have been converted to products. B) Forward and reverse reactions have stopped so that the concentration of the reactants equals the concentration of the products. C) Concentrations of products are higher than the concentrations of the reactants. D) Forward and reverse reactions continue with no effect on the concentrations of the reactants and products. E) There are equal concentrations of reactants and products, and the reactions have stopped.
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compound to mimic the effects of a known hormone that influences sexual behavior. They have turned to you for advice. Which of the following compounds is most likely to mimic the effects of the hormone? A) a compound with the same three - dimensional shape as part of the hormone B) a compound with the same number of carbon atoms as the hormone C) a compound with the same molecular mass (measured in daltons) as the hormone D) a compound with the same number of hydrogen and nitrogen atoms as the hormone E) a compound with the same number of orbital electrons as the hormone 6) Which of the following statements correctly defines a kilocalorie? A) the amount of heat required to raise the temperature of 1 g of water by 1°C B) the amount of heat required to raise the temperature of 1 kg of water by 1°F C) the amount of heat required to raise the temperature of 1,000 g of water by 1°F D) the amount of heat required to raise the temperature of 1 kg of water by 1°C E) the amount of heat required to raise the temperature of 1 g of water by 1°F 7) At what temperature is water at its densest? A) 4°C
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AP+Midterm+Review+09-10 - AP BIOLOGY Midterm Exam Review...

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