Proteins: Rossmann Fold and Cofactors Quiz
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Questions and Answers

What is the main function of the Rossmann Fold motif in proteins?

  • Aid in the formation of transmembrane structures
  • Create specific microenvironments for protein folding
  • Promote the binding of cofactors (correct)
  • Organize amino acids into parallel beta sheets

Which type of interactions play a crucial role in organizing the hydrophobic core of globular proteins?

  • Hydrogen bonding
  • Hydrophobic interactions (correct)
  • Disulfide bonds
  • Ionic interactions

What is the primary purpose of organizing amino acid chemistries into specific microenvironments in a globular protein?

  • Maintain protein flexibility
  • Facilitate enzymatic reactions (correct)
  • Prevent protein denaturation
  • Enhance protein solubility

In protein structures, which feature combines parallel beta sheets with alpha helices?

<p>Rossmann Fold motif (B)</p> Signup and view all the answers

What term describes a protein feature that contains both hydrophilic and hydrophobic regions?

<p>Amphipathic structure (D)</p> Signup and view all the answers

How does the Rossmann Fold motif relate to the binding of cofactors in proteins?

<p>It positions helices and turns to bind with cofactors. (B)</p> Signup and view all the answers

Which type of protein structure is tightly packed and compact, as opposed to fibrous proteins like collagen?

<p>Alpha helix (D)</p> Signup and view all the answers

What type of interaction between helices is essential for interhelix association to occur in protein structures?

<p>Van der Waals interactions (A)</p> Signup and view all the answers

Which motif is frequently encountered in globular proteins and consists of the sequence aa bb bbbb?

<p>Greek Key motif (D)</p> Signup and view all the answers

What type of interactions are utilized at the helix-helix interface to decrease free energy (DG°) in protein folding?

<p>Van der Waals interactions (B)</p> Signup and view all the answers

In an amphipathic structure of a protein, which part of the structure interacts favorably with water?

<p>Polar region (A)</p> Signup and view all the answers

What feature permits different angles of helices to be adopted in globular protein folding, leading to diverse functions?

<p>Linker length between helices (C)</p> Signup and view all the answers

Why are disulfide bonds important in protein stability?

<p>They create intrachain covalent linkages that increase protein stability (B)</p> Signup and view all the answers

Which of the following is NOT a reason why disulfide bonds are not present in every protein?

<p>Disulfides can form too many hydrophobic interactions (D)</p> Signup and view all the answers

What property of proteins is used to compare their stability by quantifying the melting temperature (Tm)?

<p>Degree of native vs unfolded conformation (B)</p> Signup and view all the answers

In what type of proteins are disulfide bonds mostly found?

<p>Secreted proteins (C)</p> Signup and view all the answers

Which structure in proteins is primarily stabilized by hydrophobic interactions?

<p>Amphipathic structures (D)</p> Signup and view all the answers

What is the significance of breaking only one of the disulfide bonds in a protein like bovine pancreatic trypsin inhibitor?

<p>It decreases protein stability significantly (A)</p> Signup and view all the answers

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