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FST 3111 Proteins: Basic Concepts and Functions
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FST 3111 Proteins: Basic Concepts and Functions

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Questions and Answers

What is the elemental composition of proteins?

  • 50–55% carbon, 6–7% hydrogen, 20–23% oxygen, 12–19% nitrogen, and 0.2–3.0% sulfur (correct)
  • 50–55% nitrogen, 6–7% carbon, 20–23% oxygen, 12–19% hydrogen, and 0.2–3.0% sulfur
  • 50–55% oxygen, 6–7% nitrogen, 20–23% carbon, 12–19% sulfur, and 0.2–3.0% hydrogen
  • 50–55% hydrogen, 6–7% sulfur, 20–23% nitrogen, 12–19% carbon, and 0.2–3.0% oxygen

    • Which role do proteins play in living organisms and foods?

  • Provide structure and act as catalysts (correct)
  • Participate in gelation and increase viscosity
  • Function as emulsifiers and water bonding agents
  • Cause allergies and browning reactions

    • What are examples of fibrous proteins?

  • Actin and fibrin
  • Globular and linear polypeptide chains
  • Collagen and keratin (correct)
  • Tropomyosin and elastin

    • What is the function of food proteins?

    <p>Be easily digestible and functionally useable in food products</p> Signup and view all the answers

    What is the primary source of nitrogen in proteins?

    <p>Oxygen</p> Signup and view all the answers

    What are the functional properties of proteins?

    <p>Functioning as emulsifiers and increasing viscosity</p> Signup and view all the answers

    What are the basic structural units of proteins?

    <p>Amino acids</p> Signup and view all the answers

    Which group determines the polarity, hydrophobicity, structure, and functionality of amino acids?

    <p>R Group</p> Signup and view all the answers

    In which type of proteins are alpha-helices the main structure?

    <p>Soluble (hydrophilic) proteins</p> Signup and view all the answers

    Which class of amino acids is found more in the interiors of proteins where there is little or no access to water?

    <p>Non-polar and hydrophobic amino acids</p> Signup and view all the answers

    What type of structure is formed with internal hydrogen bonds between C=O and N-H?

    <p>Alpha-helix structure</p> Signup and view all the answers

    Which group joins amino acids in peptides?

    <p>Alpha-carboxyl group</p> Signup and view all the answers

    Which amino acid behavior is characterized by being neutral, acidic, or basic?

    <p>Polar amino acids</p> Signup and view all the answers

    What refers to the arrangement of protein in space?

    <p>Tertiary structure</p> Signup and view all the answers

    How many levels of protein structure are there?

    <p>Four levels</p> Signup and view all the answers

    Which type of proteins have a high amount of beta-sheet structure?

    <p>Insoluble (hydrophobic) proteins</p> Signup and view all the answers

    What is the elemental composition of proteins?

    <p>50–55% carbon, 6–7% hydrogen, 20–23% oxygen, 12–19% nitrogen, and 0.2–3.0% sulfur</p> Signup and view all the answers

    What are the two main structural organizations of proteins?

    <p>Globular and fibrous</p> Signup and view all the answers

    What type of proteins can be formed as a result of linear aggregation of small globular proteins?

    <p>Fibrous proteins</p> Signup and view all the answers

    What are the functional properties of proteins?

    <p>Gelation, emulsifiers, water bonding, and browning</p> Signup and view all the answers

    What refers to the arrangement of protein in space?

    <p>Tertiary structure</p> Signup and view all the answers

    What role do food proteins play in food products?

    <p>Easily digestible, nontoxic, nutritionally adequate, functionally useable, and available in abundance</p> Signup and view all the answers

    What type of amino acids are generally found on the surfaces of proteins?

    <p>Charged and polar</p> Signup and view all the answers

    Which property determines the polarity, hydrophobicity, structure, and functionality of amino acids?

    <p>R-group</p> Signup and view all the answers

    What is the main structure in fibrous proteins?

    <p>Alpha-helix</p> Signup and view all the answers

    What is the primary source of nitrogen in proteins?

    <p>Legumes</p> Signup and view all the answers

    Which class of amino acids is primarily found in the interiors of proteins where there is little or no access to water?

    <p>Non-polar and hydrophobic</p> Signup and view all the answers

    Which type of protein has a high amount of beta-sheet structure?

    <p>Insoluble (hydrophobic) proteins</p> Signup and view all the answers

    What refers to the arrangement of protein in space?

    <p>Tertiary structure</p> Signup and view all the answers

    What type of structure is formed with internal hydrogen bonds between C=O and N-H?

    <p>Alpha-helix</p> Signup and view all the answers

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