globular and fibrous proteins

• What are the two main types of proteins discussed?

  Globular and fibrous proteins
• What is the primary role of fibrous proteins?

  They provide structural support
• What is an example of a fibrous protein?

  Keratin
• How do fibrous proteins achieve their strength?

  By forming long chains that are strong
• How do disulfide bridges affect keratin's strength?

  More disulfide bridges increase strength
• Why are fibrous proteins insoluble in water?

  They have many hydrophobic R groups
• What is the significance of hydrophobic R groups in fibrous proteins?

  They repel water, aiding insolubility
• What contributes to the toughness of fibrous proteins?

  Many cross bridges between polypeptide chains
• Name three main fibrous proteins.

  Keratin, elastin, collagen
• What is the structure of globular proteins?

  They have a compact 3D shape
• What is a key characteristic of globular proteins?

  They are usually soluble in water
• How do hydrophobic R groups affect globular proteins?

  They orientate away from water inside
• What is a conjugated protein?

  A globular protein with a prosthetic group
• Give an example of a prosthetic group.

  Iron in hemoglobin
• Name three main globular proteins.

  Insulin, hemoglobin, catalase
• Why are multiple choice questions common in exams for proteins?

  They test knowledge of protein properties
• What strategy is recommended for answering multiple choice questions?

  Use process of elimination
• What are the properties of fibrous proteins?

  • Strong and tough
  • Insoluble in water
  • Form long chains
  • Have many cross bridges
• What are the properties of globular proteins?

  • Compact 3D shape
  • Usually soluble in water
  • Provide metabolic roles
  • Can be conjugated proteins
• What are the differences between fibrous and globular proteins?

  Fibrous Proteins:

  • Structural roles
  • Insoluble in water
  • Long chains

  
  

  Globular Proteins:

  • Metabolic roles
  • Soluble in water
  • Compact 3D shape
• What is the importance of disulfide bridges in proteins?

  • Provide strength to fibrous proteins
  • Increase stability of protein structure
• What is the role of hydrophobic and hydrophilic R groups in protein solubility?

  • Hydrophobic R groups: orientate inside
  • Hydrophilic R groups: orientate outside
  • Determines solubility in water