Open practice

THE TWENTY, BY SIGHT

See a structure.
Know its name.

Amino acids make more sense when you recognize the side chain. Work through all 20, one structure at a time.

Polar amino acids can be recognized by oxygen in the side chain with NO charge.

Non-polar amino acids do not have any oxygens.

Acidic amino acids can be recognized by negative charges on the side chain.

Basic amino acids can be recognized by a positive charge on the side chain.

Start identifying
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FROM THE FOUNDER

“I was thinking about dropping Bio-60 until I made this site.”
— Malayna Perez Founder

STRUCTURE → IDENTITY

Your practice bench.

0 / 20identified without revealing
IDENTIFY THIS AMINO ACID

Look at the side chain.

IN PRACTICE
STRUCTURE CARD 01CHARGED FORM · UNLABELED R GROUP
Side chainRead the group attached below the shared H₃N⁺–C–COO⁻ backbone.
YOUR ANSWERAll three fields are checked separately.
Look for a functional group or carbon pattern in the side chain.

The structures follow the charged forms on your course handout. These are study diagrams; protonation can vary with pH.

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