Question

complete the table to compare the structures of a protein and a lipid.
table with columns: (blank), protein, lipid; rows: \may have multiple polypeptide chains\, \may contain fatty acids\, \may contain a hydrophilic head and hydrophobic tails\; each protein/lipid cell has a circle
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Explanation:

• May have multiple polypeptide chains: Proteins are made of one or more polypeptide chains (e.g., hemoglobin has 4), lipids don't have polypeptide chains. So Protein: Yes, Lipid: No.
• May contain fatty acids: Lipids (like triglycerides, phospholipids) have fatty acids; proteins are made of amino acids, not fatty acids. So Protein: No, Lipid: Yes.
• May contain a hydrophilic head and hydrophobic tails: Phospholipids (a lipid) have this structure; proteins don't. So Protein: No, Lipid: Yes.

Answer:

	Protein	Lipid
May contain fatty acids		$\boldsymbol{\checkmark}$
May contain a hydrophilic head and hydrophobic tails		$\boldsymbol{\checkmark}$