Biochemistry : Macromolecule Fundamentals
Study concepts, example questions & explanations for Biochemistry
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Example Questions
Example Question #23 : Lipids
What is an amphipathic molecule?
Basic ions
A molecule that has both polar and nonpolar region
Acidic ions
Molecules in crystalline form
A class of wax molecules
A molecule that has both polar and nonpolar region
An amphipathic molecule has both polar and nonpolar domains. Long-chain fatty acids are examples of amphipathic molecules.
Example Question #131 : Macromolecule Fundamentals
Poison ivy, poison oak, and poison sumac produce a compound called urushiol. Urushiol is a mixture of compounds containing catechols with long-chain alkyl groups. The severity of the allergic reaction depends on the degree of unsaturation of the alkyl groups.
If you are exposed to poison ivy, which treatment would be most effective?
Wash the area with saline
Wash the area with cold water
Wash the area with soap and water
Wash the area with dilute vinegar or lemon juice
Wash the area with soap, water, and baking soda (sodium bicarbonate)
Wash the area with soap, water, and baking soda (sodium bicarbonate)
Soap and water will work, as urushiol is amphipathic, but the addition of sodium bicarbonate is more effective. Sodium bicarbonate is a weak base and will make the urushiol more polar - and therefore more water-soluble.
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