AP Biologyeasymcq1 pt
Sulfur is most notably found in which biomolecules?
A.Proteins (cysteine and methionine)
B.DNA backbone
C.Cellulose
D.Triglycerides
Explanation
Core Concept
Cysteine's sulfhydryl groups form disulfide bridges that stabilize protein folds; methionine also carries sulfur. Sulfur is rare elsewhere in biomolecules.
Correct Answer
AProteins (cysteine and methionine)
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