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Biomolecules Test - 79

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Biomolecules Test - 79
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following is correct representation of concentration of various cations inside cell?
  • Question 2
    1 / -0
    Which of the following is NOT a nitrogen base of nucleotides present in plasmid DNA?
    Solution
    Uracil is not a nitrogen base of nucleotides present in plasmid DNA because it is only present in RNA as uridine but is replaced by thymidine in DNA .
    So, the correct option is 'Uracil'.
  • Question 3
    1 / -0
    Which one is not a cofactor?
    Solution
    An apoenzyme is an inactive enzyme, activation of the enzyme occurs upon binding of an organic or inorganic cofactor. A cofactor is a non-protein chemical compound or metallic ion that is required for an enzyme's activity. Cofactors can be considered "helper molecules" that assist in biochemical transformations. Cofactors can be divided into two major groups: organic Cofactors, such as flavin or heme, and inorganic cofactors, such as the metal ions Mg2+, Cu+, Mn2+, or iron-sulfur clusters.

    A coenzyme is an organic non-protein compound that binds with an enzyme to catalyze a reaction. Coenzymes are often broadly called cofactors, but they are chemically different. A coenzyme cannot function alone, but can be reused several times when paired with an enzyme.

    So the correct option is 'Apoenzyme'.





  • Question 4
    1 / -0
    Which of the following bond is formed during the condensation of monosaccharides?
    Solution
    A. A covalent bond is formed by sharing of electrons between the atoms.
    B. A glycosidic bond is a kind of covalent linkage by which two monosaccharides are joined together. Whenever a glycosidic bond is formed, there is the elimination of a water molecule similar to the formation of a peptide bond. These reactions are called dehydration or condensation reactions.
    C. A peptide bond is formed between the carboxyl group of one amino acid and the amino group of another amino acid.
    D. An ionic bond is formed due to electrostatic attraction between oppositely charged ions.
    So, the correct answer is 'Glycosidic bond'.
  • Question 5
    1 / -0
    How many features listed below are exhibited by flatworms (A) and bacteria (B)?

    (i) Growth by increases in mass only
    (ii) Regeneration
    (iii) Self-consciousness
    (iv) Anabolism and catabolism
    (v) Binary fission
    Solution
    Binary Fission:- By this process bacteria reproduce and increase their numbers.
    Regeneration:- It is the process by which nematodes can regrow their whole body from e single cell.
    Anabolism & Catabolism:- The process in which due to the metabolic activity of cell the dry weight of the cell increases and decreases respectively. on the other hand we can say that the anabolism is a constructive metabolism and catabolism is a destructive metabolism.
    muscle growth and annual ring of plant is the example of growth by increases in mass only which increases the body mass of the organism. usually shown in higher organism.
    Self-consciousness:- It is a mental state/ state of a mind of a organisms. exclusively found in higher organism whos's brain is well developed.
    So, the correct option is 'B'
  • Question 6
    1 / -0
    Which class of enzyme catalyzes following reaction?
    $$\overset { X }{ \underset { C }{ | }  } \overset { Y }{ \underset { C\longrightarrow \quad X-Y+C=C }{ | }  } $$
    Solution
    Hydrolases are biological enzymes that catalyze the hydrolysis of a chemical reaction. They usually divide larger molecules into two smaller molecules. It is a class containing more than 200 enzymes. Some common hydrolases are esterases, proteases, lipases etc.
    So, the correct option is 'Hydrolases'.
  • Question 7
    1 / -0
    Complete nucleic acid hydrolysis yields all the following, except
    Solution
    Hydrolysis is a process of breaking of a bond in a molecule using water. Site of cleavage are sugar, phosphate backbone or in the base. Result of hydrolysis of nucleic acids are purine and pyrimidines bases, oligonucleotide, nucleosides, ribose or deoxyribose and phosphate.
    So the correct option is 'Phosphoric acid'.
  • Question 8
    1 / -0
    In a disaccharide monomers are linked with each other through .............
    Solution
    • Disaccharides are class of sugars whose molecules contain two monosaccharide residues.
    • It is formed when two monosaccharide molecules displace a hydroxyl radical from one molecule and a hydrogen from the other and the vacant bonds on the monosaccharides are join the two monomers together.
    • Thus, a glycosidic bond is formed between the two monosaccharide molecules. 
    So, the correct answer is 'Glycosidic bonds'.

  • Question 9
    1 / -0
    Prior to the work of Avery, MacLeod and McCarty (1933-44), the genetic material through to be
    Solution
    The Avery–MacLeod–McCarty experiment was an experimental demonstration, reported in 1944 by Oswald Avery, Colin MacLeod, and Maclyn McCarty, that DNA is the substance that causes bacterial transformation, in an era when it had been widely believed that it was proteins that served the function of carrying genetic information (with the very word protein itself coined to indicate a belief that its function was primary). It was the culmination of research in the 1930s and early 20th Century at the Rockefeller Institute for Medical Research to purify and characterize the "transforming principle" responsible for the transformation phenomenon first described in Griffith's experiment of 1928: killed Streptococcus pneumoniae of the virulent strain type III-S, when injected along with living but non-virulent type II-R pneumococci, resulted in a deadly infection of type III-S pneumococci. 
    So, the correct answer is A.
  • Question 10
    1 / -0
    Proteins are formed by condensation of 
    Solution
    • Proteins are polypeptides and are called building blocks of the body.
    • They are made up of amino acids.
    • Two amino acids undergo condensation reaction to form a dipeptide.
    • Further condensation reactions result in a polypeptide.
    • The amino acid units are linked by peptide bonds or peptide linkages.
    • So, the correct answer is 'Amino acids'.
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