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Biomolecules Test - 18

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Biomolecules Test - 18
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  • Question 1
    1 / -0
    Which of the following enzyme digests other enzymes?
    Solution
    • Most of the enzymes are proteins. Proteins are biological macromolecules made up of amino acids joined together by peptide bonds. 
    • Peptidases are enzymes, which cleave or break peptide bonds.  The action of peptidase enzymes will cleave or break peptide bonds, thus breaking the primary structure of enzymes or digestion of enzyme.

      Hence, the correct answer is C.
  • Question 2
    1 / -0
    The fundamental building block of protein is :
  • Question 3
    1 / -0
    The proteins associated with nucleic acids are
    Solution
    Nucleic acids are associated with proteins. The proteins are of two types: histones and nonhistones. The histones are basic proteins; rich in basic or positively charged amino acids. The positively charged amino acids attract negatively charged DNA and this electrostatic attraction helps in the packaging of DNA.
    So, the correct is option C.
  • Question 4
    1 / -0
    Thiamine is a
    Solution
    Thiamine, thiamin or vitamin B1, named as the "thio-vitamine" ("sulfur-containing vitamin") is a vitamin of the B complex. First named aneurin for the detrimental neurological effects, if not present in the diet, it was eventually assigned the generic descriptor name vitamin B$$_1$$.
  • Question 5
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    Purines and pyrimidines polymerise to form
    Solution
    Nucleic acids are polymers of nucleotides. They are formed by joining together of long chains of nucleotides. RNA (ribonucleic acid) is a polymer of ribonucleotides and is made up of ribonucleotides joined together by phosphodiester bonds. DNA (deoxyribonucleic acid) is a polymer of deoxyribonucleotides and is made up of deoxyribonucleotides joined together by phosphodiester bonds.
    So, the correct answer is option B.
  • Question 6
    1 / -0
    Transamination is
    Solution
    Transamination reaction is the transfer of amino groups from an amino acid to a keto acid. The enzyme is transaminase. It helps in formation of different amino acids which are not formed by reductive amination.
    So, the correct answer is option A.
  • Question 7
    1 / -0
    Which of the following cannot be traced in proteins?
    Solution
    Proteins are made up of multiple peptide chains. Peptides are polymers made up of amino acids. In a peptide chain amino acids are joined together by peptide bonds. Amino acids are amphoteric compounds having both basic (amino) group as well as acidic (carboxylic) group. Hence the name amino acids. Amino acids are organic compounds made up of carbon, hydrogen, oxygen, nitrogen and sulphur. The amino, carboxylic and substituent groups are attached to the $$\alpha$$-carbon atom. Oxygen is present in the carboxylic (-COOH) group and nitrogen is present in the amino (-NH2) group. The side chain may also contain oxygen, nitrogen and sulphur in addition to carbon and hydrogen atoms.
  • Question 8
    1 / -0
    Nucleic acids are made up of
    Solution
    Nucleic acids are long chain polymers of nucleotides. The nucleotides, in turn, are phosphoric acid esters of nucleosides which mainly consists of a nitrogenous base, Sugar, and phosphate. The nitrogenous base includes purines and pyrimidines while the sugar contains ribose and deoxyribose sugar. phosphate is formed of phosphoric acid.
    So, the correct answer is option D.
  • Question 9
    1 / -0
    Simplified diagrams of macromolecules are given. 
    What is the function of the molecule of diagram C? 

    Solution
    The molecule C represents a part of double helical molecule of DNA. The DNA is a repository of genetic information. It is capable of making its own copies by the process of replication and also code for proteins by specifying the sequence of amino acids.
  • Question 10
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    What is a  prosthetic group of a protein?
    Solution
    Prosthetic groups are cofactors that bind tightly to proteins or enzymes. It is a specific non-polypeptide required for the biological function of some proteins. The prosthetic group may be organic (such as vitamin, sugar or lipid) or inorganic (such as metal ion), but is not composed of amino acids.
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