Protein Structure: Primary, Secondary, and Tertiary
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Questions and Answers

What determines the primary structure of a protein, and how does it influence the subsequent structures?

The primary structure of a protein is determined by the inherited genetic information, and it determines the secondary and tertiary structures of a protein.

What type of bonding is responsible for stabilizing the secondary structure regions of a protein?

Hydrogen bonds between atoms of the polypeptide backbone

What is the characteristic feature of an α-helix, and how does it differ from a β-pleated sheet?

An α-helix is a delicate coil held together by hydrogen bonding between every 4th amino acid, whereas a β-pleated sheet is a structure in which two or more strands of polypeptide chains lay side by side connected by hydrogen bonding.

What is the functional significance of the β-pleated sheets in the spider silk protein, and how does it relate to the spider's web?

<p>The β-pleated sheets in the spider silk protein allow the spider web to stretch and recoil.</p> Signup and view all the answers

What is the significance of the tertiary structure of a protein, and how does it arise?

<p>The tertiary structure is the overall shape of a polypeptide resulting from interactions between the side chains of various amino acids.</p> Signup and view all the answers

What is the primary force responsible for holding together the delicate coil of an α-helix, and how often does it occur between amino acids?

<p>Hydrogen bonding between every 4th amino acid</p> Signup and view all the answers

Compare and contrast the structural arrangement of polypeptide chains in an α-helix versus a β-pleated sheet.

<p>α-helix is a coil, β-pleated sheet is side by side strands</p> Signup and view all the answers

What type of interactions are responsible for positioning hydrophobic amino acids in the core of a protein, and what is the resulting effect on the tertiary structure?

<p>Hydrophobic interactions, resulting in a more compact core</p> Signup and view all the answers

How do disulfide bridges contribute to the stabilization of a protein's tertiary structure, and what amino acids are involved in this process?

<p>Disulfide bridges form between two cysteine amino acids, stabilizing the 3D structure</p> Signup and view all the answers

What is the role of hydrogen bonds in stabilizing both secondary and tertiary structures of a protein, and how do they differ in their interactions?

<p>Hydrogen bonds stabilize secondary structure by bonding between backbone atoms, and tertiary structure by bonding between side chains</p> Signup and view all the answers

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