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OpenStudy (anonymous):
The 20 amino acids vary only in their? a. carboxyl groups b. side groups c. amino groups d. lipid groups
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OpenStudy (anonymous):
Side groups. Amino acids don't have lipid groups. If you looked up the 20 amino acids, they're basically side groups linked by amino groups (NH3 or NH4) and carboxyl groups (COO or COOH)
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