AP Biology : Understanding Lipids

Study concepts, example questions & explanations for AP Biology

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Example Questions

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Example Question #121 : Macromolecules

Which of the following has both a hydrophobic and hydrophillic portion? 

Possible Answers:

phospholipids

steriods

proteins

chitin

starch

Correct answer:

phospholipids

Explanation:

A phospholipid has a hydrophobic tail and a hydrophillic head. The hydrocarbon section composes the hydrophobic tail and dislikes water. The phosphate group composes of the hydrophillic head and likes water. The combination makes a semi-permeable membrane that we know as the lipid bilayer. 

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