Biochemistry : Macromolecule Fundamentals

Study concepts, example questions & explanations for Biochemistry

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Example Questions

Example Question #551 : Biochemistry

What is an amphipathic molecule?

Possible Answers:

Acidic ions

Basic ions

Molecules in crystalline form

A class of wax molecules

A molecule that has both polar and nonpolar region

Correct answer:

A molecule that has both polar and nonpolar region

Explanation:

An amphipathic molecule has both polar and nonpolar domains. Long-chain fatty acids are examples of amphipathic molecules.

Example Question #551 : Biochemistry

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?

Possible Answers:

Wash the area with dilute vinegar or lemon juice

Wash the area with saline

Wash the area with soap, water, and baking soda (sodium bicarbonate)

Wash the area with soap and water

Wash the area with cold water

Correct answer:

Wash the area with soap, water, and baking soda (sodium bicarbonate)

Explanation:

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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