Protein Types and Functions
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Questions and Answers

Which type of protein solely provides amino acids upon hydrolysis?

  • Conjugated proteins
  • Complex proteins
  • Derived proteins
  • Simple proteins (correct)
  • Which of the following proteins is classified as a lipoprotein?

  • Keratin
  • Collagen
  • Histone
  • Hemoglobin (correct)
  • What is the primary structural feature that connects amino acids in a protein?

  • Hydrogen bonds
  • Peptide links (correct)
  • Ionic bonds
  • Disulfide bridges
  • Which of these proteins is a conjugated protein?

    <p>Globulin (A)</p> Signup and view all the answers

    Which of the following is NOT a biological function of proteins?

    <p>Energy storage (A)</p> Signup and view all the answers

    What type of protein consists of only amino acids and does not include other biochemical components?

    <p>Simple proteins (D)</p> Signup and view all the answers

    What are the terminal groups called at either end of a polypeptide chain?

    <p>N-terminal and C-terminal (D)</p> Signup and view all the answers

    In which type of protein classification would you find keratin and collagen?

    <p>Structural proteins (C)</p> Signup and view all the answers

    What distinguishes conjugated proteins from simple proteins?

    <p>Presence of non-protein parts (B)</p> Signup and view all the answers

    Which of the following is an example of an immunoglobulin?

    <p>Antibody (C)</p> Signup and view all the answers

    What is the primary function of transferrin in the body?

    <p>Iron transport (B)</p> Signup and view all the answers

    Which of the following correctly describes ferritin?

    <p>A storage form of iron (A)</p> Signup and view all the answers

    Which type of protein primarily participates in the transport of oxygen within the body?

    <p>Hemoproteins (A)</p> Signup and view all the answers

    What differentiates primary protein derivatives from secondary protein derivatives?

    <p>Primary derivatives result from denaturation, while secondary arise from hydrolysis. (D)</p> Signup and view all the answers

    What does coagulated albumin represent?

    <p>A primary protein derivative (B)</p> Signup and view all the answers

    Which of the following best describes nucleoproteins in the context of their components?

    <p>Proteins associated with nucleic acids (B)</p> Signup and view all the answers

    What characterizes the action of hydrolyzing agents on proteins?

    <p>Peptide bonds are cleaved. (D)</p> Signup and view all the answers

    Which of the following is an example of a secondary protein derivative?

    <p>Peptone (C)</p> Signup and view all the answers

    What is the role of FAD/FMN in flavoproteins?

    <p>Hydrogen carrier (D)</p> Signup and view all the answers

    What is the effect of heat or acid on proteins?

    <p>Denaturation occurs without peptide bond breakage (C)</p> Signup and view all the answers

    What is a key characteristic of gelatin in relation to dietary protein value?

    <p>Deficient in essential amino acids such as tryptophan (A)</p> Signup and view all the answers

    Which of the following statements about coagulation of proteins is correct?

    <p>Coagulation changes protein structure from liquid to solid (B)</p> Signup and view all the answers

    Which type of protein is characterized as lacking one or more essential amino acids?

    <p>Gelatin (D)</p> Signup and view all the answers

    What non-protein part is associated with glycoproteins?

    <p>Carbohydrates (C)</p> Signup and view all the answers

    Which of the following proteins is a metalloprotein?

    <p>Ceruloplasmin (A)</p> Signup and view all the answers

    What is the primary role of lipoproteins in the body?

    <p>Transporting lipids in the blood (A)</p> Signup and view all the answers

    The caseinogen is classified as which type of protein?

    <p>Phosphoprotein (C)</p> Signup and view all the answers

    Which characteristic is NOT true about serum globulin?

    <p>It is solubilized in water (A)</p> Signup and view all the answers

    What distinguishes high biological value proteins from low biological value proteins?

    <p>Complete essential amino acid profile (B)</p> Signup and view all the answers

    Which of the following is considered a function of antibodies?

    <p>Immune response (C)</p> Signup and view all the answers

    Flashcards

    Protein Definition

    Organic complex nitrogenous compounds formed from C, H, O, N (sometimes S), combining amino acids into polypeptide chains.

    Protein Structure

    Polypeptide chains of amino acids linked by peptide bonds (-CO-NH-), with a C-terminal end and an N-terminal end.

    Peptide Bond

    The link between amino acids in proteins, formed from a carbonyl group and an amine group.

    Simple Protein

    A protein that, when chemically broken down (hydrolyzed), only consists of amino acids.

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    Protein Classification

    Simple proteins, conjugated proteins, and derived proteins categorize them according to their components.

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    Conjugated Proteins

    Proteins that contain non-protein components (prosthetic groups) besides amino acids.

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    Derived Proteins

    Proteins produced from the breakdown of simple or conjugated proteins.

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    Protein Roles (Enzymes)

    Biological catalysts that speed up chemical reactions in living organisms.

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    Protein Roles (Hormones)

    Chemical messengers that regulate various bodily functions.

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    Protein Importance

    Proteins play crucial roles in various biological functions, including structural support, enzymatic catalysis, and regulation.

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    Coagulation

    Change in protein structure from liquid to solid or thicker liquid.

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    Gelatin source

    Obtained from collagen by boiling.

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    Gelatin property (digestion)

    Easily digested.

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    Gelatin nutritional value

    Low biological value; Deficient in some amino acids (e.g., tryptophan).

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    High biological value protein

    Contain all essential amino acids (e.g., casein, albumin, globulin).

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    Low biological value protein

    Lack one or more essential amino acids (e.g., gelatin, gliadin, vegetable proteins).

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    Glycoprotein example

    Hormones, antibodies, blood group antigens, receptors, and enzymes.

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    Lipoprotein function

    Lipid transport in blood.

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    Phosphoprotein example

    Caseinogen (milk protein).

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    Transferrin

    A protein responsible for transporting iron (Fe+2) in the blood.

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    Ferritin

    A protein that stores iron (Fe+3) in the body.

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    Insulin

    A hormone that regulates blood glucose levels by allowing cells to take up glucose.

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    Chromoprotein

    A protein that contains a colored pigment.

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    Hemoglobin

    A chromoprotein that transports oxygen in the blood.

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    Myoglobin

    A chromoprotein that stores oxygen in muscle tissue.

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    Flavoprotein

    A chromoprotein containing flavin pigments, involved in electron transfer.

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    Nucleoprotein

    A protein complexed with nucleic acids (DNA or RNA).

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    Primary Protein Derivatives

    Products of protein denaturation, where the peptide bonds remain intact.

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    Secondary Protein Derivatives

    Products of protein hydrolysis, where the peptide bonds are broken, resulting in smaller peptides or amino acids.

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    Study Notes

    Protein Types

    • Proteins are complex nitrogenous organic compounds.
    • They are formed from carbon (C), hydrogen (H), oxygen (O), nitrogen (N), and sometimes sulfur (S).
    • Proteins are polymers of amino acids linked together by peptide bonds (-CO-NH-).
    • The ends of a polypeptide chain are:
      • C-terminal: COOH group at one end.
      • N-terminal: NH2 group at the other end.

    Biological Importance of Proteins

    • Enzymes: Catalyze biochemical reactions.
    • Hormones (protein hormones): Regulate bodily functions.
    • Plasma proteins: Contribute to blood functions.
    • Immunoglobulins (antibodies): Defend against pathogens.
    • Receptors: Receive and transmit signals.
    • Hemoglobin: Transports oxygen.
    • Lipoproteins: Transport lipids.
    • Supporting structures: (e.g., cartilage, bone, skin, hair).

    Classification of Proteins

    • Simple proteins: Composed solely of amino acids.
      • Examples: Albumin, globulin, histone, protamine, glutelin, gliadin, and albuminoids (scleroproteins). Sub-types such as keratin and collagen are examples of scleroproteins.
      • Albumin is coagulated by heat. Globulin is not.
    • Conjugated (compound) proteins: Contain a non-protein component (prosthetic group).
      • Sub-types (examples and functions):
        • Glycoproteins: Carbohydrate component
        • Lipoproteins: Lipid component
        • Phosphoproteins: Phosphoric acid component
        • Metalloproteins: Metal component (e.g., copper, iron, zinc)
        • Chromoproteins: Pigment component (e.g., hemoglobin)
        • Nucleoproteins: Nucleic acid component (e.g., ribosomes)
    • Derived proteins: Products of simple or conjugated protein denaturation or hydrolysis.
      • Sub-types such as proteoses, peptones, peptides, and amino acids are secondary and derived proteins, denoting progressive hydrolysis. They are characterized by a loss of structural elements and hence differences in molecular weight.

    Gelatin

    • Derived from collagen by boiling and cooling.
    • Easily digested.
    • Not a complete protein (low biological value) as it lacks some essential amino acids such as tryptophan.

    Biological Value of Proteins

    • High biological value proteins: Contain all essential amino acids (e.g., casein in milk, albumin, globulin).
    • Low biological value proteins: Lack one or more essential amino acids (e.g., gelatin, gliadin, vegetable proteins).

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    Related Documents

    Protein Types PDF

    Description

    Learn about the different types of proteins, their biological importance, and classification. This quiz explores the role of enzymes, hormones, and immunoglobulins in the body, as well as the structure of proteins. Test your knowledge on protein functions and classifications.

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