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Questions and Answers
What type of bond links amino acids together to form a polypeptide?
What type of bond links amino acids together to form a polypeptide?
- Hydrogen bond
- Peptide bond (correct)
- Ionic bond
- Disulfide bond
Which structural level in a protein is defined by its unique sequence of amino acids?
Which structural level in a protein is defined by its unique sequence of amino acids?
- Quaternary structure
- Primary structure (correct)
- Secondary structure
- Tertiary structure
What happens to a protein when it denatures?
What happens to a protein when it denatures?
- It forms stronger peptide bonds between its amino acids.
- It retains its functional shape and properties.
- It gains a more complex quaternary structure.
- It loses its higher-level structure and function. (correct)
Which of the following is an example of a conjugated protein?
Which of the following is an example of a conjugated protein?
The interactions between which groups are MOST responsible for a protein's tertiary structure?
The interactions between which groups are MOST responsible for a protein's tertiary structure?
Flashcards
Primary Protein Structure
Primary Protein Structure
The linear sequence of amino acids in a protein chain.
Secondary Protein Structure
Secondary Protein Structure
The three-dimensional shape formed by hydrogen bonds between amino acids within the polypeptide chain.
Tertiary Protein Structure
Tertiary Protein Structure
The overall three-dimensional shape of a single polypeptide chain, determined by interactions between R-groups.
Quaternary Protein Structure
Quaternary Protein Structure
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Protein Denaturation
Protein Denaturation
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Study Notes
Protein Structure
- Amino acids are the building blocks of proteins
- Proteins are made of carbon, hydrogen, nitrogen, and oxygen
- There are 20 different amino acids, each with a unique R group
- Peptide bonds hold amino acids together in a dehydration reaction
- Polypeptides are chains of amino acids, with a nitrogen (N) and a carboxyl (C) terminal end
- Conjugated proteins have a non-protein component, like an ion or carbohydrate
- Primary structure is the sequence of amino acids
- Secondary structure is the folding pattern of the amino acid chain (e.g., alpha-helices, beta-sheets)
- Tertiary structure is the three-dimensional shape of a polypeptide, determined by interactions between R groups
- Quaternary structure is the arrangement of multiple tertiary proteins
- Denatured proteins lose their higher level structure, and therefore function
- Proteins have various functions, including: storing amino acids, producing hormones, signaling, providing structural support, creating immunity, and catalyzing reactions (enzymatic activity)
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