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Protein Structure and Conformations

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Questions and Answers

What is the main stabilizing force in an α-helix?

Hydrogen bonds between nearby residues (correct)

Van der Waals forces between the backbone and side chains

Electrostatic interactions between side chains

Hydrophobic interactions

What is the primary influence on the structure of a protein?

The type of amino acid residues

The presence of hydrogen bonds

The size of the protein

The properties of the peptide bond (correct)

Which of the following amino acid residues is most likely to disrupt an α-helix?

Leucine

Alanine

Proline (correct)

Glycine

What is the main difference between parallel and antiparallel β-sheets?

The direction of the hydrogen bonds Signup and view all the answers

What is the function of β-turns in proteins?

To connect ends of adjacent segments of an antiparallel β-sheet Signup and view all the answers

What is the approximate percentage of a globular protein that is organized into repetitive structures?

50% Signup and view all the answers

What is the main reason why Glycine is often found in β-turns?

Its high conformational flexibility Signup and view all the answers

What is the main reason why Proline is often found in β-turns?

Its inability to rotate around the N-Cα bond Signup and view all the answers

What is the main difference between α-helices and β-sheets?

The way the backbone is arranged Signup and view all the answers

What is the main reason why α-helices are often found in proteins?

Because they can fit into the major groove of dsDNA Signup and view all the answers