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Questions and Answers
Proteins can be classified based on their shape or their composition. Which one of the following is an example of a fibrous protein?
Proteins can be classified based on their shape or their composition. Which one of the following is an example of a fibrous protein?
- Carrier proteins
- Keratin
- Collagen (correct)
- Enzymes
Which one of the following is an example of a globular protein?
Which one of the following is an example of a globular protein?
- Collagen
- Keratin
- Enzymes (correct)
- Carrier proteins
Which type of protein is often insoluble in water?
Which type of protein is often insoluble in water?
- Globular proteins
- Fibrous proteins (correct)
- Compact and spherical proteins
- Long and rod-shaped proteins
Which type of protein is composed of only amino acids?
Which type of protein is composed of only amino acids?
Which level of protein structure refers to the linear sequence of amino acids?
Which level of protein structure refers to the linear sequence of amino acids?
Which type of secondary protein structure is often depicted schematically as a piece of curled ribbon?
Which type of secondary protein structure is often depicted schematically as a piece of curled ribbon?
What is the term for a protein composed of many subunits?
What is the term for a protein composed of many subunits?
Which level of protein structure refers to the linear sequence of amino acids?
Which level of protein structure refers to the linear sequence of amino acids?
Which type of protein is often insoluble in water?
Which type of protein is often insoluble in water?
Which type of protein is composed of only amino acids?
Which type of protein is composed of only amino acids?
Which type of secondary protein structure is often depicted schematically as a piece of curled ribbon?
Which type of secondary protein structure is often depicted schematically as a piece of curled ribbon?
What is the term for a protein composed of many subunits?
What is the term for a protein composed of many subunits?
Which of the following is NOT a level of protein structure?
Which of the following is NOT a level of protein structure?
Which of the following is an example of a conjugated protein?
Which of the following is an example of a conjugated protein?
Which type of protein structure is formed by hydrogen bonds between distant carboxyl and amino groups?
Which type of protein structure is formed by hydrogen bonds between distant carboxyl and amino groups?
Which of the following is an example of a protein that is held together by disulfide bonds?
Which of the following is an example of a protein that is held together by disulfide bonds?
What is the term for a protein composed of two subunits?
What is the term for a protein composed of two subunits?
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Study Notes
Protein Classification
- Proteins can be classified based on their shape or composition.
Protein Types
- Fibrous proteins: example is collagen.
- Globular proteins: example is hemoglobin.
- Insoluble proteins in water: fibrous proteins.
- Proteins composed of only amino acids: simple proteins.
Protein Structure
- Primary structure: refers to the linear sequence of amino acids.
- Secondary structure: often depicted schematically as a piece of curled ribbon, formed by hydrogen bonds between distant carboxyl and amino groups (alpha helix or beta pleated sheet).
- Tertiary and quaternary structures: formed by interactions between side chains (hydrophobic, ionic, and disulfide bonds).
- Quaternary structure: term for a protein composed of many subunits.
Conjugated Proteins
- Example: hemoglobin (a protein with a non-protein component, heme).
Protein Bonds
- Disulfide bonds: hold proteins together, example is insulin.
Protein Subunits
- Oligomer: term for a protein composed of two or more subunits (monomers).
- Dimer: term for a protein composed of two subunits.
Non-Protein Structure Level
- Evolutionary relationships: NOT a level of protein structure.
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