Biology Chapter: Carbohydrates
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Questions and Answers

What type of glucose is used to form cellulose?

  • Beta glucose (correct)
  • Delta glucose
  • Gamma glucose
  • Alpha glucose
  • What role do hydrogen bonds play in cellulose structure?

  • They prevent cellulose from dissolving in water.
  • They facilitate the breakdown of cellulose into glucose.
  • They provide stability to the microfibrils. (correct)
  • They determine the chemical reactivity of cellulose.
  • In which type of organism would one primarily find cellulose?

  • Plant cells (correct)
  • Bacteria
  • Animal cells
  • Fungi
  • Which of the following is NOT a characteristic of cellulose?

    <p>It serves as energy storage in animal cells. (B)</p> Signup and view all the answers

    How many chains are linked together to form cellulose microfibrils?

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

    Which disaccharide is specifically associated with energy provision for cells?

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

    What type of reaction is involved in the formation of maltose from two monosaccharides?

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

    What type of glycosidic bond is present in maltose?

    <p>1-4 glycosidic bond (D)</p> Signup and view all the answers

    Which of the following is used to detect reducing sugars?

    <p>Benedict's solution (C)</p> Signup and view all the answers

    What process breaks down disaccharides into monosaccharides?

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

    What distinguishes amylopectin from amylose in starch molecules?

    <p>Amylopectin contains occasional branches in its glucose chains. (B)</p> Signup and view all the answers

    What type of bond links glucose molecules in polysaccharides?

    <p>1-4 glycosidic bonds (C)</p> Signup and view all the answers

    In which part of the body is glycogen primarily stored?

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

    Which test is used to identify the presence of starch?

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

    What is a characteristic feature of glycogen compared to starch?

    <p>Glycogen is more readily mobilized during energy demands. (A)</p> Signup and view all the answers

    What is the distinguishing structural feature of α-glucose compared to β-glucose?

    <p>The position of the hydroxyl group at C1 (A)</p> Signup and view all the answers

    Which statement about fructose is true?

    <p>Fructose is a hexose sugar. (B), Fructose has a carbonyl group at C2. (C)</p> Signup and view all the answers

    How does galactose's solubility compare to fructose?

    <p>Galactose is less soluble than fructose. (B)</p> Signup and view all the answers

    In the structure of β-glucose, how is every other molecule oriented?

    <p>Inverted 180° (C)</p> Signup and view all the answers

    What is the molecular formula for both α-glucose and β-glucose?

    <p>C6H12O6 (B)</p> Signup and view all the answers

    What type of bond is formed between two monosaccharides during the creation of a disaccharide?

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

    Which disaccharide is formed from glucose and galactose?

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

    What is released during the condensation reaction that forms a disaccharide?

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

    What is the specific linkage called in the disaccharide maltose?

    <p>α-1,4-Glycosidic linkage (A)</p> Signup and view all the answers

    Which of the following disaccharides is commonly found in fruit?

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

    What is the primary role of carbohydrates in the body?

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

    Which type of carbohydrate is primarily used for energy storage in animals?

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

    Which carbohydrate is classified as a disaccharide?

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

    What type of carbohydrate is formed when multiple monosaccharides undergo condensation reactions?

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

    Which statement correctly differentiates between amylose and amylopectin?

    <p>Amylose has 1,4 glycosidic links and forms helices, while amylopectin has 1,6 glycosidic links. (B)</p> Signup and view all the answers

    What elements are carbohydrates primarily composed of?

    <p>Carbon, hydrogen, and oxygen (D)</p> Signup and view all the answers

    Which of the following is a good dietary source of carbohydrates?

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

    Which of the following statements about starch is NOT true?

    <p>Starch is soluble in water. (B)</p> Signup and view all the answers

    What occurs during hydrolysis in relation to disaccharides?

    <p>Disaccharides are broken down into monosaccharides. (D)</p> Signup and view all the answers

    What type of reaction occurs when complex sugars are broken down into monosaccharides?

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

    Which of the following statements regarding Benedict's solution is correct?

    <p>The color red signifies a high concentration of reducing sugar. (A)</p> Signup and view all the answers

    Which of the following describes amylose?

    <p>It is a linear polymer. (B)</p> Signup and view all the answers

    What is a key benefit of starch as a carbohydrate store?

    <p>It is readily converted to energy. (C)</p> Signup and view all the answers

    Which of the following polysaccharides is primarily found in animals?

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

    Which of the following statements about carbohydrates is true?

    <p>Carbohydrates serve as the primary energy source for living organisms. (D)</p> Signup and view all the answers

    What is the common formula structure for monosaccharides?

    <p>(CH₂O)n (A)</p> Signup and view all the answers

    Which of the following is NOT an example of a monosaccharide?

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

    Hexose sugars are characterized by which of the following properties?

    <p>They are sweet-tasting and soluble. (A)</p> Signup and view all the answers

    What type of carbohydrate consists of three or more subunits?

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

    What is the primary function of glycogen in animal cells?

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

    Which of the following substances is detected by a blue/black color change when tested with iodine?

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

    What type of glycosidic bonds connects the β-glucose monomers in cellulose?

    <p>1-4 glycosidic bonds (D)</p> Signup and view all the answers

    Which of the following correctly describes the structure of glycogen?

    <p>A branched polymer of α-glucose (D)</p> Signup and view all the answers

    What characteristic of cellulose gives plants their structural strength?

    <p>Hydrogen bonds between microfibrils (C)</p> Signup and view all the answers

    Flashcards

    What are carbohydrates?

    Carbohydrates are organic compounds that provide energy, store energy and provide structural support. They are made up of carbon, hydrogen and oxygen.

    What are Monosaccharides?

    Simple sugars like glucose, fructose and galactose are the building blocks of carbohydrates. These are called monosaccharides.

    What are disaccharides?

    Two simple sugars joined together, like in sucrose and maltose, form disaccharides.

    What are Polysaccharides?

    Complex carbohydrates, like starch and cellulose, are made up of many sugar units linked together. These are called polysaccharides.

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    How do plants and animals store energy?

    Plants store energy as starch, while animals store energy as glycogen. Both are types of polysaccharides.

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    α-glucose

    A six-carbon sugar where the hydroxyl group (OH) on carbon 1 is below the plane of the ring.

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    β-glucose

    A six-carbon sugar where the hydroxyl group (OH) on carbon 1 is above the plane of the ring.

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    Fructose

    A six-carbon sugar that is very soluble in water.

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    Galactose

    A six-carbon sugar that is less soluble in water than Fructose.

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    Hexose Sugar

    A simple sugar containing six carbon atoms. Examples include Glucose, Fructose and Galactose.

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    What is a disaccharide?

    A double sugar formed by the combination of two monosaccharides linked by a glycosidic bond.

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    What is Maltose?

    Maltose is a disaccharide made from two glucose molecules. It is an energy source for cells.

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    What is Sucrose?

    Sucrose is a common disaccharide found in fruits. It is composed of glucose and fructose.

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    What is Lactose?

    Lactose is a disaccharide found in milk. It is composed of glucose and galactose.

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    What is a 1-4 glycosidic bond?

    This bond joins two monosaccharides together in disaccharides. This results in a straight chain molecule.

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    What types of bonds are found in polysaccharides?

    Glycosidic bonds are the specific type of covalent bond that links sugar units (monosaccharides) together in polysaccharides.

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    What is amylopectin?

    Amylopectin is a branched form of starch that has a complex structure with many branches, making it more easily broken down by enzymes.

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    What is amylose?

    Amylose is a linear form of starch that has a simpler, unbranched structure.

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    Where is glycogen stored in the body?

    Glycogen is a highly branched polysaccharide that serves as the primary energy storage molecule in animals. It is stored in the liver and muscles.

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    Cellulose

    A complex carbohydrate found in plant cell walls, composed of long chains of beta-glucose molecules linked together.

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    Cellulose Microfibrils

    Hundreds of cellulose chains linked together by hydrogen bonds, forming strong, rigid structures within plant cell walls.

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    Hydrogen Bonds in Cellulose

    A type of bond that forms between adjacent cellulose chains, contributing to the structural integrity of cellulose fibers.

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    Cellulose: Structural Role

    The primary structural component of plant cell walls, providing strength and rigidity to the cell.

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    Maltose

    Consists of two glucose molecules joined together; found in malt sugars and fruit.

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    Condensation reaction

    A chemical reaction where two molecules combine to form a larger molecule, releasing a water molecule in the process.

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    Glycosidic bond

    The bond formed between two monosaccharides when they join together via condensation.

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    Hydrolysis reaction

    A chemical reaction that breaks down a larger molecule into smaller molecules by adding a water molecule.

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    Starch

    A polysaccharide formed from α-glucose, composed of two types: amylose and amylopectin. Amylose is mostly linear, and amylopectin is branched due to 1,6 linkages.

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    Monosaccharide

    A simple sugar with the chemical formula (CH₂O)n, where n is the number of carbon atoms.

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    Disaccharide

    Two monosaccharides joined together, for example, glucose and fructose linked to form sucrose.

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    Polysaccharide

    A type of carbohydrate that is made up of many sugar units linked together, like starch and cellulose.

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    Alpha (α) and Beta (β) glucose

    Structural forms (isomers) of glucose that differ in the position of the hydroxyl group on carbon 1.

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    Sucrose

    A disaccharide made up of glucose and fructose, commonly found in fruits.

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    Hydrolysis

    A chemical reaction in which water is added to break down a complex molecule into smaller monomers. For example, breaking down a polysaccharide (like starch) into simple sugars (like glucose).

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    Amylose

    A linear polymer of glucose molecules, found in starch. It's joined by 1-4 glycosidic bonds.

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    Amylopectin

    A branched polymer of glucose molecules, found in starch. It's joined by 1-4 and 1-6 glycosidic bonds, creating branches.

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    Starch test

    A test used to identify the presence of starch.

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    Glycogen

    A type of polysaccharide that serves as the primary energy storage molecule in animals.

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    Glycogen structure

    A branched polymer composed of α-glucose units, similar in structure to amylopectin.

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    Cellulose structure

    A structural polysaccharide found in plant cell walls. It is a linear polymer formed from β-glucose monomers.

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