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Biomolecules Test - 19

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Biomolecules Test - 19
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  • Question 1
    1 / -0
    Endopeptidase of plant kingdom is
    Solution
    Endopeptidase are the proteolytic enzymes which cleave the peptide chain at internal locations. They break peptide bonds of non terminal amino acids (i.e. within the molecule), in contrast to exopeptidases, which break peptide bonds from their end-pieces. One example is papain obtained from unripe papaya.
  • Question 2
    1 / -0
    Which of the following is a milk protein?
    Solution
    Proteins are a very versatile biomolecules performing a variety of structural and functional roles. Pepsin is a proteolytic enzyme secreted as pepsinogen in the stomach. Myosin is a protein found in muscle tissue. Lactogen is milk sugar and casein is milk protein.
  • Question 3
    1 / -0
    Genetic material of TMV is 
    Solution
    TMV has RNA as a genetic material. The RNA present in the TMV is a positive-sense single-stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanaceae. The infection causes characteristic patterns, such as "mosaic"-like mottling and discolouration on the leaves. TMV was the first virus ever to be discovered. 
    So, the correct answer is option A.
  • Question 4
    1 / -0
    Nitrogen is the main constituent of
    Solution
    Proteins are the linear chain of amino acids formed by joining together of a number of amino acids through peptide bonds. The peptide bond between two amino acids is formed by a condensation reaction between amino group of one amino acid and carboxylic group of another amino acid. The amino acids are amphoteric compounds having both basic (amino) as well as acidic (carboxylic) groups. The amino acids are rich in nitrogen because of the amino group. Protein contains 16% of nitrogen.
  • Question 5
    1 / -0
    Ribose sugar is present in
    Solution
    Nucleic acids are polymers of nucleotides. Ribonucleic acids (RNA) are polymers of ribonucleotides. Ribonucleotides are made up of the ribose sugar, a nitrogenous base, and phosphoric acid. The ATP (adenosine triphosphate) is a ribonucleotide. Other ribonucleotides in RNA are UTP, GTP, and CTP.
    So, the correct answer is option D.
  • Question 6
    1 / -0
    Enzymes that catalyse inter-conversion of optical, geometrical or positional isomers are
    Solution
    Ligases are the enzymes which catalyze joining together of two DNA segments. Lyases catalyze the breaking of chemical bonds without hydrolysis while hydrolases catalyze hydrolytic cleavage of bonds. Isomerases catalyze interconversion of optical, geometrical or positional isomers of a particular enzyme.
  • Question 7
    1 / -0
    Ribozyme is
    Solution

    Solution:

    Correct answer is option D.

    Explanation for correct option:

    • A ribozyme is an RNA molecule with a well-defined tertiary structure that enables it to act like a protein enzyme in catalyzing biochemical and metabolic reactions within a cell.
    • These RNA molecules are enzymes that are not composed of proteins.
    • Ribozymes function as part of the large subunit ribosomal RNA to link amino acids during protein synthesis.

  • Question 8
    1 / -0
    Most common protein and carbohydrate found in a cow's milk are
    Solution
    The proteins are the most versatile biomolecules and serve a variety of purpose. Some of the most important types of proteins are nutrient and storage proteins, transport proteins, storage proteins, enzymes, defence proteins, regulatory proteins, structural proteins etc. 
    Ovalbumin of egg white and casein of milk are the important nutrient and storage proteins of milk. Disaccharides are carbohydrates made up of two units of monosaccharides. The disaccharide lactose which yields D-galactose and D-glucose on hydrolysis occurs only in milk.
  • Question 9
    1 / -0
    If all the peptide bonds of protein are broken, then the remaining part is
    Solution
    Proteins are polypeptide macromolecules. They are composed of amino acids joined together with the help of peptide bonds. If peptide bonds of a protein are cleaved amino acids will be released. This is exactly what happens during digestion of dietary proteins. The proteins are hydrolyzed by breaking of peptide bonds and resulting amino acids are absorbed.
  • Question 10
    1 / -0
    The type of linkage present in carbohydrates is
    Solution
    Glycosidic bonds are the bonds formed between hemiacetal or hemiketal group of carbohydrates and hydroxyl group of another molecule. It is a condensation reaction which leads to release of water molecules.

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