Lab 1: Identification of carbohydrates
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Questions and Answers

Quin es el tipus de sucre que es redueix a través de Tollen's reagent?

  • Galactosa (correct)
  • Sacarosa
  • Fructosa (correct)
  • Glucosa (correct)

    • Quin dels següents compostos es classifica com un heteropolisacàrid?

  • Inulina
  • Glucogen
  • Amilopectina
  • Pectin (correct)

    • Quina prova es fa servir per identificar els pentoses?

  • Prova de Bial (correct)
  • Prova de Barfoed
  • Prova de Fehling
  • Prova de Molisch

    • Quin dels següents compostos és un polisacàrid?

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

    Quina reacció utilitza el cupròs per identificar la presència de sucres reductors?

    <p>Prova de Benedict (B), Prova de Fehling (D)</p> Signup and view all the answers

    Quin d'aquests és un exemple de monosacàrid?

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

    Quina és la classi de carbohidrat formada per cadenes llargues de monosacàrids?

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

    Quina substància es forma quan un polisacàrid és hidrolitzat?

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

    Quin metabolisme es relaciona amb els oligosacàrids?

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

    Quin es lo resultat del test de Molisch per identificar los carbs?

    <p>Un anell violeta amb naphthol (C)</p> Signup and view all the answers

    Quin dels seguenti tests es especific per l'identificacions de la galactosa?

    <p>Test de Mucic Acid (D)</p> Signup and view all the answers

    Cossí lo test de Benedict indica la preséncia d'un sucre redut?

    <p>Amb un precipitat vermelh (A)</p> Signup and view all the answers

    Quina es la durada del test de Barfoed per monosacàrids?

    <p>3 min (C)</p> Signup and view all the answers

    Quin test requisit d'un agent oxidant per l'identificacions de sucres?

    <p>Test de Fehling (A)</p> Signup and view all the answers

    Cossí es reconeguda la preséncia de ketohexoses dins lo test de Seliwanoff?

    <p>Per un producte vermelh (D)</p> Signup and view all the answers

    Quin es lo resultat d'un teste per pentoses dins lo test de Bi al?

    <p>Producte de furfural (B)</p> Signup and view all the answers

    Cossí lo test de Fehling indica la preséncia de sucres reduts?

    <p>Amb un precipitat de cuprous oxide (D)</p> Signup and view all the answers

    Qual test se utiliza per verificar la preséncia de furfural dins los monosacàrids?

    <p>Test de Molisch (B)</p> Signup and view all the answers

    Quin es lo terminus per descriure un saccharide format per un molécule de glucose e un molécule de fructose?

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

    Quina reaccion proporciona un resultat roge amb un òxid cuprós quand se testa la preséncia d'un aldose?

    <p>Reaccion de benedict (D)</p> Signup and view all the answers

    En quina forma se presenta la lactosa?

    <p>Galactose e glucose (B)</p> Signup and view all the answers

    Quin test se utiliza per identificar la preséncia de fructose?

    <p>Test de Seliwanoff (C)</p> Signup and view all the answers

    Quin dels següents es un monosaccharide?

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

    Quin dels següents composts es insoluble en aiga?

    <p>Mucic acid (B)</p> Signup and view all the answers

    Quin d'aquests composts es un ketose?

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

    Quina es la formula generala per los disaccharides?

    <p>C_n(H2O)_(n-1) (D)</p> Signup and view all the answers

    Quin test se utiliza per detectar la preséncia de pentoses?

    <p>Test de Bials (B)</p> Signup and view all the answers

    Quina es la propietat especifica dels disaccharides en preséncia de certs agents químics?

    <p>Reduir l'òxid cuprós (D)</p> Signup and view all the answers

    What type of sugars are ribose and galactose classified as?

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

    Which test is specifically used to identify the presence of fructose?

    <p>Seliwanoff's test (C)</p> Signup and view all the answers

    Which reagent gives a reddish cuprous oxide result indicating a positive test for reducing sugars?

    <p>Benedict's reagent (A)</p> Signup and view all the answers

    What is produced when lactose undergoes hydrolysis?

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

    What is a typical result when conducting the Molisch test on carbohydrates?

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

    Which monosaccharide is soluble in water?

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

    Which of the following reactions would lead to a blue-green product when a pentose is present?

    <p>Bial's test (B)</p> Signup and view all the answers

    What does the Seliwanoff test specifically indicate when conducted on sugars?

    <p>Presence of ketoses (C)</p> Signup and view all the answers

    What type of carbohydrate is formed by the combination of glucose and fructose?

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

    Which substance provides a positive result in Barfoed's test for monosaccharides?

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

    Which test specifically identifies ketoses?

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

    Which of the following sugars takes the longest to react in the Barfoed's Test?

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

    What color change indicates the presence of furfural in the identification of pentoses in Bi al's Test?

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

    Which test requires nitric acid for the specific identification of galactose?

    <p>Mucic Acid Test (B)</p> Signup and view all the answers

    In the Seliwanoff Test, which product results from the reaction of ketohexoses?

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

    What is the result of the Molisch Test for carbohydrate identification?

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

    What is formed when galactose is oxidized during the Mucic Acid Test?

    <p>Insoluble mucic acid (C)</p> Signup and view all the answers

    Which of the following tests indicates reducing sugars through the formation of a reddish precipitate?

    <p>Benedict's Test (A)</p> Signup and view all the answers

    Which reagent is used in the Seliwanoff Test to differentiate between aldose and ketose?

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

    What duration is required for ketohexoses to react in the Seliwanoff Test?

    <p>2 minutes (C)</p> Signup and view all the answers

    Which of the following types of polysaccharides consists of more than one kind of monosaccharide?

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

    Which reagent is used to oxidize reducing sugars?

    <p>Tollen's reagent (A)</p> Signup and view all the answers

    In which test are pentoses identified?

    <p>Bial's test (D)</p> Signup and view all the answers

    What type of carbohydrate is inulin classified as?

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

    Which property distinguishes a reducing sugar from a non-reducing sugar?

    <p>Oxidation by specific reagents (A)</p> Signup and view all the answers

    What is the primary product formed when lactose is hydrolyzed?

    <p>Galactose and glucose (B)</p> Signup and view all the answers

    Which test is NOT used to identify the presence of reducing sugars?

    <p>Mucic acid test (D)</p> Signup and view all the answers

    Which of the following components is involved in conducting Bial's test?

    <p>Copper(II) sulfate (B)</p> Signup and view all the answers

    What is the significance of white precipitate formation in a reagent test for reducing sugars?

    <p>Demonstrates successful oxidation (B)</p> Signup and view all the answers

    Which of the following tests identifies the presence of glucuronic acid?

    <p>Mucic acid test (A)</p> Signup and view all the answers

    Study Notes

    Objectius

    • Examina las reaccions quimicas caracteristiques per identificar diferents carboidrats.

    Teoria

    • Los carboidrats son fonts d'energia rapida.
    • Composats de carboni, hidrogeni e oxigen.
    • Antiga teoria: "hidrat de carboni" (relacion H/O de 2:1)
    • Actualament classificats coma polihidroxialdehids o polihidroxicetones.
    • Tres classes principals: monosacàrids, oligosacàrids (disacàrids) e polisacàrids.

    Monosacàrids

    • Composts cristal·lins solubles en aigua.
    • Aldehids o cetones alifàtiques amb un grup carbonil e un o mès grups hidroxil.
    • També anomenats sucres simples o unicells.
    • Els hexoses més comuns son la glucosa, fructosa e galactosa.
    • Els pentoses més comuns son l'arabinosa e l'xilosa.

    Oligosacàrids

    • Polymers de monosacàrids.
    • Pes molecular relativament baix (menys de 20 unitats).
    • Units per enllaços glicosídics.
    • Disacàrids exemples: sacarosa, lactosa e maltosa.

    Polisacàrids

    • Polymers de monosacàrids amb un pes molecular elevad.
    • Mès de 20 unitats.
    • Exemples: glucogen (forma de reserva d'energia dels animals), midó (forma de reserva d'energia de las plantes), celulosa (fibra basada en beta-glucosa), inulina (reserva de fructosa en algunes plantes).
    • Homopolisacàrids: contenen un sol tipus de monosacàrid.
    • Heteropolisacàrids: contenen mès d'un tipus de monosacàrid.

    Nomenclatura dels carboidrats

    • El nom de cada sucre acaba en "-osa" (exemple: glucosa, fructosa).
    • També s'anomenen per el seu grup funcional (aldehid –aldo–, cetona –ceto–) e el nombre de carbonis (pent, hex, etc.).
    • Exemples: glucosa (aldohexosa), fructosa (cetohexosa), ribosa (aldopentosa).

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    Carbohydrates Practical Quiz 2018-2019 PDF

    Description

    Examinez los diferents tipus de carboidrats e las reaccions quimicas que los caracterizan. Estudiatz los monosacàrids, oligosacàrids e polisacàrids per comprene la sua importància e estructura. Aqueste cuestionari es destinat als estudiants que vòlon aprofitar los coneissenças culinaris e biologics.

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