Quiz On Carbohydrates Biochemistry

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Quiz On Carbohydrates Biochemistry - Quiz

Hey, do you have good knowledge about carbohydrates biochemistry, or are you learning this subject? Here's a quiz on carbohydrates biochemistry for you to test your knowledge regarding the same subject. Carbohydrates, as most of us know, are the most abundant biomolecules on earth. If you think you understand them very well, then you must prove your skills by scoring more than 80% on this test. Best of luck, buddy!


Questions and Answers
  • 1. 

    What is the relationship between glucose, mannose and galactose?

    • A.

      They are isomers

    • B.

      They are epimers

    • C.

      They are ketoses

    • D.

      No relationship exists

    Correct Answer
    B. They are epimers
    Explanation
    Glucose, mannose, and galactose are all monosaccharides that have the same molecular formula (C6H12O6) but differ in the arrangement of their hydroxyl groups. Specifically, glucose and mannose differ in the configuration of the hydroxyl group at carbon 2, while glucose and galactose differ in the configuration of the hydroxyl group at carbon 4. This makes glucose, mannose, and galactose epimers, which are a type of stereoisomer that differ in the configuration of only one chiral center.

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  • 2. 

    What is used to identify reducing sugars and in the past was used to test for diabetes mellitus?

    • A.

      Benedict's test

    • B.

      N-glycosylation

    • C.

      O-glycosylation

    • D.

      None of the above

    Correct Answer
    A. Benedict's test
    Explanation
    Benedict's test is used to identify reducing sugars and was historically used to test for diabetes mellitus. This test involves the reaction of reducing sugars with Benedict's reagent, which contains copper sulfate. The reducing sugars reduce the copper ions in the reagent, resulting in the formation of a colored precipitate. This test is no longer commonly used for diagnosing diabetes mellitus, but it is still used in various laboratory settings to detect the presence of reducing sugars.

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  • 3. 

    What is a storage form of carbohydrate in plants?

    • A.

      Glycogen

    • B.

      Cellulose

    • C.

      Chitin

    • D.

      Starch

    Correct Answer
    D. Starch
    Explanation
    Starch is the storage form of carbohydrate in plants. It is a polysaccharide made up of glucose molecules and is stored in plant cells as granules. Starch serves as a reserve energy source for plants and can be broken down into glucose when needed for growth, development, or reproduction. It is commonly found in roots, tubers, and seeds of plants.

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  • 4. 

    What best describes amylose?

    • A.

      Unbranched linear polymer with alpha 1-4 glycosidic linkages

    • B.

      Unbranched linear polymer with beta 1-4 glycosidic linkages

    • C.

      Highly branched, branched sites contain alpha 1-6 glycosidic linkages

    • D.

      Highly branched, branched sites contain beta 1-6 glycosidic linkages

    Correct Answer
    A. Unbranched linear polymer with alpha 1-4 glycosidic linkages
    Explanation
    Amylose is a type of starch that is composed of unbranched linear chains of glucose molecules. These glucose molecules are linked together through alpha 1-4 glycosidic linkages. This means that the glucose molecules are connected by a bond between the first carbon of one glucose molecule and the fourth carbon of the next glucose molecule. This linear structure allows amylose to form a helical shape, making it compact and insoluble in water.

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  • 5. 

    What best describes amylopectin?

    • A.

      Unbranched linear polymer with alpha 1-4 glycosidic linkages

    • B.

      Unbranched linear polymer with beta 1-4 glycosidic linkages

    • C.

      Highly branched, branched sites contain alpha 1-6 glycosidic linkages

    • D.

      Highly branched, branched sites contain beta 1-6 glycosidic linkages

    Correct Answer
    C. Highly branched, branched sites contain alpha 1-6 glycosidic linkages
    Explanation
    Amylopectin is a highly branched polymer with branched sites containing alpha 1-6 glycosidic linkages. This means that it has a main chain made up of glucose units linked by alpha 1-4 glycosidic linkages, with branches occurring at alpha 1-6 glycosidic linkages. These branches give amylopectin its highly branched structure, allowing for more efficient storage of glucose molecules and easier access for enzymes involved in its metabolism.

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  • 6. 

    What is the storage form of carbohydrate in animals?

    • A.

      Glycogen

    • B.

      Cellulose

    • C.

      Chitin

    • D.

      Starch

    Correct Answer
    A. Glycogen
    Explanation
    Glycogen is the storage form of carbohydrate in animals. It is a complex molecule made up of glucose units that are linked together. Animals store glycogen primarily in their liver and muscles. When energy is needed, glycogen is broken down into glucose to provide fuel for the body. Unlike starch, which is the storage form of carbohydrate in plants, glycogen is more highly branched, allowing for quick and efficient release of glucose when needed. Cellulose and chitin are structural carbohydrates found in the cell walls of plants and the exoskeletons of arthropods, respectively.

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  • 7. 

    Where is glycogen stored?

    • A.

      In the kidney and liver

    • B.

      In the stomach and kidney

    • C.

      In the muscle and liver

    • D.

      In the muscle and stomach

    Correct Answer
    C. In the muscle and liver
    Explanation
    Glycogen is a form of glucose storage in the body. It is primarily stored in the liver and muscles. The liver stores glycogen to maintain blood glucose levels and provide energy to the body when needed. The muscles store glycogen to provide energy for muscle contractions during physical activity. Therefore, the correct answer is "in the muscle and liver."

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  • 8. 

    What is the major constituent of plant cell wall?

    • A.

      Glycogen

    • B.

      Cellulose

    • C.

      Chitin

    • D.

      Starch

    Correct Answer
    B. Cellulose
    Explanation
    Cellulose is the major constituent of plant cell walls. It is a complex carbohydrate made up of long chains of glucose molecules. Cellulose provides structural support to plant cells, making them rigid and allowing them to maintain their shape. It also forms a barrier that protects the cell from external threats. Glycogen, chitin, and starch are not major constituents of plant cell walls. Glycogen is the main storage form of glucose in animals, chitin is found in the exoskeleton of arthropods, and starch is the main storage form of glucose in plants.

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  • 9. 

    What forms the exoskeleton of anthropods?

    • A.

      Agarose

    • B.

      Cellulose

    • C.

      Chitin

    • D.

      Starch

    Correct Answer
    C. Chitin
    Explanation
    Chitin forms the exoskeleton of anthropods. Chitin is a tough and flexible polysaccharide that provides structural support and protection to the bodies of anthropods such as insects, crustaceans, and arachnids. It is a key component of their exoskeleton, which acts as a protective outer covering. Chitin is a strong material that allows anthropods to maintain their shape and withstand physical stress. It is not agarose, cellulose, or starch that forms the exoskeleton, but chitin.

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  • 10. 

    What is used in the laboratory for DNA electrophoresis?

    • A.

      Agarose

    • B.

      Cellulose

    • C.

      Chitin

    • D.

      Glycogen

    Correct Answer
    A. Agarose
    Explanation
    Agarose is used in the laboratory for DNA electrophoresis. Agarose is a polysaccharide derived from seaweed and is commonly used as a gel matrix for separating DNA fragments based on their size during electrophoresis. It forms a porous gel structure that allows the DNA molecules to migrate through it when an electric current is applied. Agarose is preferred over other options like cellulose, chitin, and glycogen due to its low cost, ease of use, and ability to provide good resolution for DNA fragments of different sizes.

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  • Current Version
  • May 10, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 29, 2010
    Quiz Created by
    Pharmdnate
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