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                <OTText id="995349f2-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;Create an image that clearly shows both ends of the string of amino acids. In the snapshot, use the text annotation tool  to mark both ends." />
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                <OTText id="9b176828-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;Use the link above to open and explore the 20 rotatable 3D amino acids. Then select the &quot;Sidechain&quot; color scheme. The atoms that are colored gray are the same in every amino acid. What are they called?" />
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                <OTText id="9b17b64e-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;On the page of 3D amino acids, find glutamine and histidine. Use the different color schemes to select the true statement(s) below. (More than one statement may be true)." />
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                    <OTText id="9b17b650-80d3-11dd-a62c-b12dfe14e4a1" text="they are both polar amino acids" />
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                <OTText id="9cc56655-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;Describe the distribution of electrons and polarity of an O-H bond." />
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                <OTText id="9cc58d69-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;Describe the distribution of electrons and polarity of a C-H bond." />
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                <OTText id="9e79a61b-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;Which surface shows the correct charges for Leucine?" />
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            <OTQuestion id="9e7a4264-80d3-11dd-a62c-b12dfe14e4a1" name="http://ri-itest.concord.org/SAMActivities/FourLevelsOfProteinStruct/FourLevelsOfProteinStruct_v1/page5.cml">
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                <OTText id="9e7a4265-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;Choose the best way to complete this sentence:&#xA;When two atoms in a bond have very different electronegativities, the surface of the molecule..." />
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                    <OTText text="has no charge." />
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                <OTText id="9e7ab79c-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;Explain how the colors on the surfaces of the side chains indicate whether it is polar or non-polar." />
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                <OTText id="a2154380-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;Is water a polar or non-polar molecule? Explain your answer by writing about the bonds in water." />
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                <OTText id="a21606d4-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;Which type of amino acid is hydrophobic?" />
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                    <OTText text="neither - they both don't attract water very well" />
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                <OTText id="a21654fb-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;Use your knowledge of positive and negative charge to explain why polar molecules attract each other and water better than non-polar molecules." />
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            <OTQuestion id="a216a31e-80d3-11dd-a62c-b12dfe14e4a1" name="http://ri-itest.concord.org/SAMActivities/FourLevelsOfProteinStruct/FourLevelsOfProteinStruct_v1/page6.cml">
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                <OTText id="a216ca2f-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;Which solvent(s) leads to folding of the protein?" />
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            <OTQuestion id="a2173f65-80d3-11dd-a62c-b12dfe14e4a1" name="http://ri-itest.concord.org/SAMActivities/FourLevelsOfProteinStruct/FourLevelsOfProteinStruct_v1/page6.cml">
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                <OTText id="a2173f66-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;Where do the amino acids with polar side chains end up when the protein chain folds?" />
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                    <OTText text="evenly throughout the folded protein" />
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            <OTQuestion id="a5abfeeb-80d3-11dd-a62c-b12dfe14e4a1" name="http://ri-itest.concord.org/SAMActivities/FourLevelsOfProteinStruct/FourLevelsOfProteinStruct_v1/page8.cml">
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                <OTText id="a5abfeec-80d3-11dd-a62c-b12dfe14e4a1" text="&#xA;Snapshot of an alpha helix:" />
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