Peptide Bond Resonance and Rotations Quiz
18 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which type of amino acid is most likely to disrupt the α-helix structure due to impossible bond rotation?

  • Leucine
  • Alanine
  • Proline (correct)
  • Glycine

In an α-helix, which amino acids are considered strong helix formers?

  • Phenylalanine and Tryptophan
  • Proline and Glycine
  • Alanine and Leucine (correct)
  • Lysine and Arginine

Which type of amino acid is known to have a positive charge on its side chain?

  • Lysine (correct)
  • Valine
  • Serine
  • Glutamine

How does the sequence of amino acids affect the stability of an α-helix?

<p>It affects the formation of hydrogen bonds within the helix (D)</p> Signup and view all the answers

Which feature of the peptide bond contributes to the large macroscopic dipole moment of the α-helix?

<p>The amide group having a negative charge (A)</p> Signup and view all the answers

Why are peptide bonds aligned roughly parallel with the helical axis in an α-helix?

<p>To maximize hydrogen bonding potential (A)</p> Signup and view all the answers

What type of structure is formed by hydrogen bonds between the backbone amides in different strands of a β sheet?

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

Which type of β sheet has strands that are oriented in the same direction?

<p>Parallel sheet (C)</p> Signup and view all the answers

What creates a pleated sheet-like structure in a β sheet?

<p>Tetrahedral geometry of the α carbon (D)</p> Signup and view all the answers

In antiparallel β sheets, how are the H-bonded strands oriented?

<p>In opposite directions (A)</p> Signup and view all the answers

What type of interactions are called sheets in β structures?

<p>Hydrogen bonds (C)</p> Signup and view all the answers

How do the hydrogen bonds between strands in parallel β sheets differ from antiparallel β sheets?

<p>They are linear in parallel sheets and bent in antiparallel sheets. (C)</p> Signup and view all the answers

Which factor contributes to peptide bonds being less reactive compared to esters?

<p>Rigidity and stability (D)</p> Signup and view all the answers

Why is rotation around the peptide bond not permitted?

<p>Resonance structure (C)</p> Signup and view all the answers

In a fully extended polypeptide, what are the angles for rotation around the α carbon—amide nitrogen bond and the α carbon—carbonyl carbon bond?

<p>(180°, 180°) (B)</p> Signup and view all the answers

What determines the secondary structure of a protein?

<p>Organization around the peptide bond and identity of the R groups (A)</p> Signup and view all the answers

What is the energy change (ΔGº') for peptide bond hydrolysis?

<p>-10 kJ/mol (C)</p> Signup and view all the answers

What defines oligopeptides compared to polypeptides?

<p>Number of residues (D)</p> Signup and view all the answers

More Like This

Peptide Bonds in Molecular Biology
12 questions
Amino Acids and Peptide Bonds Quiz
26 questions

Amino Acids and Peptide Bonds Quiz

ConvincingNovaculite6657 avatar
ConvincingNovaculite6657
Peptide Bonds and Structures
29 questions
Use Quizgecko on...
Browser
Browser