By David L. Wilson
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Extra resources for 11th Hour: Introduction to Biology (Eleventh Hour - Boston)
Example text
Contains many carbon-carbon double bonds. does not contain double bonds. Chapter 3 Molecules and Macromolecules of Life Topic Test 3: Answers 1. False. Glycerol is combined with fatty acids to make fats. 2. True. Fats are made by linking three fatty acids to glycerol. 3. True. We will see that phospholipids make up about half of a typical membrane. 4. False. Fats contain three such chains. 5. d. Lipids are (mostly) nonpolar molecules. 6. d. Unsaturated and polyunsaturated fatty acids contain double bonds.
Hydrophobic and uncharged b. Hydrophilic and polar c. Nonpolar d. Both a and c e. All of the above 6. The atomic mass of an element can be approximated by adding the following numbers: a. The number of protons plus electrons b. The number of protons plus neutrons c. The number protons, plus neutrons, plus electrons d. The number of different isotopes of the atom 26 Chapter 2 Atoms, Bonds, Water, and Carbon 7. The difference between 12C and 14C is that a. 14C has two more electrons. b. 14C has two more protons.
Methyl e. Phosphate Short Answer 7. Why are methyl groups nonpolar? Topic Test 1: Answers I. True. Sulfur is electronegative, and so produces a slight positive charge on the hydrogen, leading to its being polar. 2. True. We will see that phosphate groups, alternating with sugar groups, form the backbones of DNA molecules. 3. True. Both aldehydes and ketones are carbonyl groups. 4. a. Notice that answer a consists mostly of methyl groups, and is nonpolar. All of the other molecules have polar groups present.
