Unit 1 · 1.7 — Proteins [cite: 9, 24]

Everything to learn here

• Concept: The ultimate 3D shape and subsequent biological function of a protein are entirely determined by its specific sequence of amino acids [cite: 8, 20].
• Concept: Primary structure is the linear sequence of amino acids; secondary structure involves local folding (alpha-helices, beta-sheets) driven by backbone hydrogen bonds [cite: 8, 14, 20].
• Concept: Tertiary structure is the complex 3D folding driven by R-group interactions (hydrophobic interactions, disulfide bridges, ionic bonds); quaternary structure arises when multiple polypeptide chains interact [cite: 8, 14, 20].
• Vocabulary: Amino Acid — the monomer of proteins, containing an amino group, a carboxyl group, and a variable R-group that determines its chemical properties [cite: 13, 14].
• Vocabulary: Peptide Bond — the covalent bond formed between the carboxyl group of one amino acid and the amino group of the next [cite: 14].
• Vocabulary: Denaturation — the unraveling and loss of a protein's native confirmation due to the disruption of weak chemical bonds by extreme heat or pH changes [cite: 14, 28, 29].
• Skill: FRQ Task Verb "Evaluate" — Evaluate the structural consequences of a specific amino acid substitution (e.g., replacing a polar amino acid with a nonpolar one) [cite: 17, 19, 20].
• Skill: Identify how DNA mutations cause amino acid substitutions and distinguish between dependent variables and controls in biological experiments.
• Concept: A protein's primary structure is defined by its amino acid sequence, which ultimately determines the molecule's final shape.
• Concept: Protein function depends on four levels of structure, including quaternary interactions between multiple polypeptide chains.

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