Four Levels of Organization
About the Lecture
The lecture Four Levels of Organization by Georgina Cornwall, PhD is from the course The Macromolecules of Life.
Included Quiz Questions
Which of the following can cause proteins to denature? Select all that apply.
- Changes in ion concentration
- Changes in pH
- Changes in temperature
- A stable environment
- Chaperones
Which of the following is paired INCORRECTLY with respect to the structural organization of proteins?
- Quinary structure – association between the –R and carboxyl groups of different amino acids
- Primary structure – sequence of amino acids joined via peptide bonds
- Tertiary structure – associations between the –R groups of various amino acids in a peptide chain
- Quaternary structure – association of different peptide chains
- Secondary structure – hydrogen bonds between the carboxyl and amino groups of different amino acids
Which of the following best describes a beta-pleated sheet?
- The wavy sheet-like appearance due to the linking of two or more beta sheets via hydrogen bonding
- The wavy sheet-like appearance due to the linking of two or more alpha-helices via disulfide bonds
- The wavy sheet-like appearance due to hydrophobic interactions between two or more beta sheets
- The wavy sheet-like appearance due to hydrophobic interactions between two or more alpha-helices
- The wavy sheet-like appearance due to the linking of two or more beta strands via ionic bonds
Which statement is NOT true regarding the tertiary structure of proteins?
- When the four subunits of hemoglobin come together, they form a tertiary structure.
- The tertiary structure of proteins involves the associations between the –R groups of amino acids.
- –R groups determine the shape of an amino acid chain folding into its protein.
- Disulfide bridges, ionic interactions, and hydrophobic interactions play a significant role in stabilizing the tertiary structure of proteins.
- The tertiary structure of proteins may involve repetitive patterns of motifs or domains.
Which of the following best describes the quaternary structure of a protein?
- A complex of two or more polypeptide chains held together by noncovalent forces
- A complex of two or more amino acids held together by covalent bonds
- A complex of two or more amino acids held together by noncovalent bonds
- A complex of two or more polypeptide chains held together by covalent bonds
- A complex of two or more polysaccharide chains held together by covalent bonds
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Author of lecture Four Levels of Organization
Georgina Cornwall, PhD
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I saw many times the video, take notes but I don't understand at all this video; think is some confusing :(
amazing lecture, finally i understood the tertiary structure for the first time
