AP Biologymediummcq1 pt
A mutation replaces one amino acid with another at a single position. Which structure level changes first?
A.Primary
B.Secondary only
C.Quaternary only
D.No level changes
Explanation
Core Concept
The sequence itself is the primary structure, so swapping one residue changes it immediately. Higher levels may or may not change depending on whether folding tolerates the substitution.
Correct Answer
APrimary
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