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2. Protein structure: Primary, secondary, tertiary & quatrenary...

   www.khanacademy.org/science/biology/macromolecules/proteins-and-amino-acids/a/...

   Introduction to proteins and amino acids. Overview of protein structure. Tertiary structure of proteins. Orders of protein structure. Proteins.

3. Oops. Something went wrong. Please try again. | Khan Academy

   www.khanacademy.org/.../proteins-and-amino-acids/v/tertiary-structure-of-proteins

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4. Oops. Something went wrong. Please try again. - Khan Academy

   www.khanacademy.org/test-prep/mcat/biomolecules/amino-acids-and-proteins1/v/...

   The four levels of protein structure are primary, secondary, tertiary, and quaternary. It is helpful to understand the nature and function of each level of protein structure in order to fully understand how a protein works. By Tracy Kovach.

5. Oops. Something went wrong. Please try again. | Khan Academy

   www.khanacademy.org/test-prep/mcat/biomolecules/amino-acids-and-proteins1/a/...

   Explanation of the structure and function of globular proteins.

6. Proteins (practice) | Macromolecules | Khan Academy

   www.khanacademy.org/science/biology/macromolecules/proteins-and-amino-acids/e/...

   Lesson 5: Proteins. Introduction to amino acids. Peptide bond formation. Introduction to proteins and amino acids. Overview of protein structure. Tertiary structure of proteins. Orders of protein structure.

7. Khan Academy

   www.khanacademy.org/science/biology/gene-expression-central-dogma/translation...

   Discover how mRNA is translated into polypeptides, the building blocks of proteins, in this interactive article from Khan Academy.

8. Khan Academy

   www.khanacademy.org/test-prep/mcat/biomolecules/enzyme-structure-and-function/...

   Learn about enzyme structure and function, including how enzymes work and their role in biological processes.

9. Khan Academy

   es.khanacademy.org/.../v/tertiary-structure-of-proteins

   Khan Academy ... Khan Academy

10. Oops. Something went wrong. Please try again. - Khan Academy

    www.khanacademy.org/science/organic-chemistry/bond-line-structures-alkanes...

    Common and systematic naming - Iso, Sec and Tert prefixes

11. The bronchial tree (video) | Khan Academy

    www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/...

    People and plants. The bronchial tree. Inhaling and exhaling. How does lung volume change? Thermoregulation in the lungs.