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Questions and Answers
When hydrogen bonds are formed between the polypeptide backbones of separate polypeptide chains, what are they called?
When hydrogen bonds are formed between the polypeptide backbones of separate polypeptide chains, what are they called?
- Antiparallel bonds
- Intrachain bonds
- Parallel bonds
- Interchain bonds (correct)
What type of structure is primarily found in the core region of globular proteins?
What type of structure is primarily found in the core region of globular proteins?
- α-helices only
- A combination of α-helices, β-sheets, and nonrepetitive sequences (correct)
- Nonrepetitive sequences only
- Interchain bonds
What is the arrangement of N-terminal and C-terminal ends of β-strands in an antiparallel β-sheet?
What is the arrangement of N-terminal and C-terminal ends of β-strands in an antiparallel β-sheet?
- Both C-terminal ends together
- Both N-terminal ends together
- Random
- Alternating (correct)
In a β-sheet formed by a single polypeptide chain folding back on itself, what type of hydrogen bonds are present?
In a β-sheet formed by a single polypeptide chain folding back on itself, what type of hydrogen bonds are present?
Which structural elements are usually adjacent in the final folded protein due to packing side chains close to each other?
Which structural elements are usually adjacent in the final folded protein due to packing side chains close to each other?
Which type of β-sheet arrangement involves all the N-termini of the β-strands together?
Which type of β-sheet arrangement involves all the N-termini of the β-strands together?
What type of structures are the α-helix and β-sheet in proteins?
What type of structures are the α-helix and β-sheet in proteins?
Which part of the peptide bond is involved in hydrogen bonding in proteins?
Which part of the peptide bond is involved in hydrogen bonding in proteins?
Which family of proteins has a nearly entirely α-helical structure and is a major component of hair and skin?
Which family of proteins has a nearly entirely α-helical structure and is a major component of hair and skin?
What type of bonds stabilize an α-helix in proteins?
What type of bonds stabilize an α-helix in proteins?
Which characteristic determines the rigidity of keratins found in hair and skin?
Which characteristic determines the rigidity of keratins found in hair and skin?
What is the term used to describe regular arrangements of amino acids located near each other in the linear sequence of a polypeptide?
What is the term used to describe regular arrangements of amino acids located near each other in the linear sequence of a polypeptide?
Which type of secondary structure involves peptide bond components that are all involved in hydrogen bonding?
Which type of secondary structure involves peptide bond components that are all involved in hydrogen bonding?
How many amino acids are present in each turn of an α-helix?
How many amino acids are present in each turn of an α-helix?
What do hydrogen bonds do collectively to the helix?
What do hydrogen bonds do collectively to the helix?
In which type of secondary structure are the peptide chains almost fully extended?
In which type of secondary structure are the peptide chains almost fully extended?
Which type of secondary structure involves peptide bond components linked to each other through intrachain hydrogen bonds?
Which type of secondary structure involves peptide bond components linked to each other through intrachain hydrogen bonds?
What is the relationship between amino acid residues spaced three or four residues apart in the primary sequence when folded in an α-helix?
What is the relationship between amino acid residues spaced three or four residues apart in the primary sequence when folded in an α-helix?
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