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Lipids and Carbohydrates: Summary Questions
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<strong>Lipids and Carbohydrates:</strong> Summary Questions
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In exploring lipids and sugars, what have we learned?
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In the model to the left, three molecules tagged as "A", "B" and "C" are
placed in water. Click the "<img src="play.gif"> Run" button to run
the model and observe what happens.<br><br>Based on your observation,
which molecule is the most polar?
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Molecule A
Molecule B
Molecule C
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Compare two molecules made primarily of carbon and hydrogen, one with
some oxygen atoms and one without any. Which of the following statements
are true? (Check all that apply.)
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<html>Oxygen increases the polarity of the bonds in the molecule.
<html>Oxygen's electronegativity is equal to carbon's, so the bonds are polar.
<html>Oxygen pulls electrons away from hydrogen, making polar bonds.
<html>Carbon pulls electrons away more than oxygen, making the bonds polar.
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Which of the statements below about membrane phospholipids is NOT true?
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They have polar "heads."
They have nonpolar "tails."
They form bilayers in water.
They form many hydrogen bonds.
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Cellulose is made of multiple long polysaccharide chains that line up
side by side in parallel. What keeps the cellulose molecules stuck
together?
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Explain how the presence of oxygen-hydrogen bonds affects the solubility
of glucose.
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