SME
Biochemistry · Problem type
Levels of protein structure
Use this for “Is a disulfide bond between two cysteines far apart in the chain part of the primary, secondary, tertiary or quaternary structure?”
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Which level of structure does each feature belong to?
Tap a card, then tap its group.
Ask what holds the feature: peptide bonds, backbone hydrogen bonds, side chains within one chain, or contacts between chains.
Assumptions
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Primary structure is the sequence alone: which amino acids, in what order, joined by peptide bonds.
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Secondary structure is local shape held by hydrogen bonds between backbone C=O and N–H groups, not side chains.
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Tertiary structure is the fold of one whole chain, held by side chains; quaternary is how two or more chains fit together.
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