PracticeExam1_sp09KEY

PracticeExam1_sp09KEY - Practicetest1 KEY Part I: (one...

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Practice test 1 KEY Part I: (one point each) 1. Which molecule is reduced in the following chemical reaction? Glyceraldehyde phosphate + NAD + diphosphoglycerate + NADH + H + a. glyceraldehyde phosphate b. the electrons c. NAD + d. Phosphate 2. The atomic number of carbon is 6. A carbon atom has __________ protons and __________ electrons. a. 6, 6 b. 3, 3 c. 6, 3 d. 6, 12 3. Ions are atoms that have: a. Different numbers of neutrons b. Lost an electron c. Gained or lost an electron d. Gained an electron 4. Nonpolar covalent bonds are different from polar covalent bonds because: a. electrons are shared unequally in nonpolar covalent bonds and are shared equally in polar covalent bonds b. electrons are shared in nonpolar covalent bonds and are lost or gained in polar covalent bonds c. electrons are shared equally in nonpolar covalent bonds and are shared unequally in polar covalent bonds d. electrons are lost in nonpolar covalent bonds and are gained in polar covalent bonds 5. Why is water so essential for life? Read all the choices carefully before selecting your answer. a. Water moderates the effects of temperature. b. The atoms in water molecules are held together in polar covalent bonds. c. When water freezes, it forms ice that floats. d. All of the answers are correct . 6. A solution of pH 7 is considered: a. Basic b. Acidic c. Neutral d. Ionic 7. The atoms Mg+ and Cl– would most likely be attached to each other by a(n): 1
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Practice test 1 KEY a. hydrogen bond b. ionic bond c. neutral bond d. covalent bond 8. Carbohydrates are a class of biological molecules that include: a. ring-shaped molecules that are soluble in water b. monosaccharides, disaccharides, and polysaccharides c. components of DNA and RNA d. all of the above 9. Saturated fats: a. have a chemical equation with double covalent bonds which makes it look linear b. are solid at room temperature c. are liquid at room temperature d. have a chemical equation with double bonds which make them look kinked 10. Phospholipids contain a "head group" that is _________ and two fatty acid "tails" that are __________. a. hydrophilic, hydrophobic b. hydrophilic, hydrophilic c. hydrolyzed, nonhydrolyzed d. hydrophobic, hydrophilic 11. Proteins are polymers of: a. amino acids b. nucleotides c. sugars d. none of the above 12. A nucleotide is composed of: a. A phosphate group and a nitrogen-containing base b. a sugar and a phosphate group c. a sugar and a nitrogen-containing base d. a sugar, a phosphate group, and a nitrogen-containing base 13. Proteins are macromolecules that can perform many different functions within an organism. This diversity of function for this macromolecule is due to the unique nature of one of its four functional groups that is bound to a central carbon atom. Which functional group is responsible for the wide diversity of function
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PracticeExam1_sp09KEY - Practicetest1 KEY Part I: (one...

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