chapter2johnson

chapter2johnson - Chapter 2 The Chemistry of Living Things....

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Chapter 2 The Chemistry of Living Things. Multiple-choice and true-false questions. Name___________________________________ MULTIPLE-CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The total number of protons and neutrons in an atom can best be determined from which of the following? 1) _______ A) atomic number B) the chemical symbol C) subscript number following the chemical symbol D) atomic mass E) the charge on the atom 2) Which of the following is not true regarding hydrogen bonds? 2) _______ A) form between polar molecules B) are stronger than a covalent bond C) provide the force that gives proteins their unique shape D) important in the structure of DNA E) provide an attractive force between the negative pole of one molecule and the positive pole of another molecule 3) Which of the following is true regarding the structure of the atom? 3) _______ A) The nucleus is composed of equal numbers of positively charged particles and negatively charged particles. B) All electrons are located at the same distance from the nucleus. C) Most of the mass of an atom is due to its protons and neutrons. D) Neutrons carry a negative charge. E) In small elements, such as carbon, electrons have a positive charge; in larger elements, such as barium, electrons have a negative charge. 4) Ninety - nine percent of human body weight is made up of only six different elements. These include all but which one of the following? 4) _______ A) hydrogen B) nitrogen C) magnesium D) phosphorus E) carbon 5) Which of the following is not a molecule? 5) _______ A) H 2 O B) CO 2 C) NaCl D) C E) H 2 6) Given a certain atom is electrically neutral and contains five electrons, how many protons will it have? 6) _______ A) one B) four C) five D) fifteen E) ten 7) Which of the following is not a function of a protein? 7) _______ A) stores genetic material B) aids in muscle contraction C) acts as a catalyst D) provides structural support E) forms part of the cell membrane
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8) Which of the following is the correct list of lipid subclasses? 8) _______ A) DNA, RNA, and nucleic acids B) polysaccharides, proteins, and steroids C) triglycerides, phospholipids, and steroids D) steroids, phospholipids, and fat E) steroids, oligosaccharides, and triglycerides 9) Which of the following best explains how an atom with seven electrons in its outermost shell will react with another atom? 9) _______ A) This atom will develop a positive charge once the reaction has proceeded. B) This atom will lose seven electrons in a reaction in order to fill its outermost shell. C) This atom will most likely form a covalent bond with another atom, thereby becoming an
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chapter2johnson - Chapter 2 The Chemistry of Living Things....

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