Biomolecules (Zoology)

Biomolecules (Zoology)

Easy Questions
Moderate Questions

Advanced Zoology

Animal Kingdom
Structural Organisation in Animals
Digestion and Absorption
Breathing and Exchange of Gases
Body Fluids and Circulation
Excretory Products and their Elimination
Locomotion and Movement
Neural Control and Coordination
Chemical Coordination and Integration
Human Reproduction
Human Health and Disease
Biotechnology Principles and Processes
Biomolecules (Zoology)
Evolution (Zoology)
Biotechnology and its Applications
Reproductive Health
  1. The basic unit of nucleic acid is








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    Nucleic acid (DNA and RNA) comprise of polynucleotides. Each nucleotide consist of nitrogenous bases, pentose sugar and phosphoric acid.

    Correct Option: D

    Nucleic acid (DNA and RNA) comprise of polynucleotides. Each nucleotide consist of nitrogenous bases, pentose sugar and phosphoric acid.

  1. A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is








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    According to Chargaff’s rule, the amount of adenine is always equal to thymine and that of guanine equal to cytosine. Moreover,
    A + G = T + C.
    120 + 120 = 120 + 120
    240 = 240
    So there will be 480 nucleotides in all.

    Correct Option: D

    According to Chargaff’s rule, the amount of adenine is always equal to thymine and that of guanine equal to cytosine. Moreover,
    A + G = T + C.
    120 + 120 = 120 + 120
    240 = 240
    So there will be 480 nucleotides in all.

  1. DNA is composed of repeating units of








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    DNA is a long, double helix consisting of repeating units of deoxyribonucleotides.

    Correct Option: D

    DNA is a long, double helix consisting of repeating units of deoxyribonucleotides.

  1. Which is not consistent with double helical structure of DNA?








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    The ratios for the (A+ G)/ (T+C) are constant at approximately 1.0 for the different organisms. Each of these organisms contain a double stranded genome. The percentage of Guanine and Cytosine are almost equal to each other, similarly the percentages of Adenine and Thymine are almost equal to each other as well. In other words, the percentage of purines should be equal to the percentage of pyrimidines for double stranded DNA. This means that
    (A + G) = (C + T)
    The (A + T)/ (C + G) ratios are not constant for all the species The relative numbers of (A + T) base pairs and (G + C) base pairs are unique to each organism and can vary between the different species.

    Correct Option: C

    The ratios for the (A+ G)/ (T+C) are constant at approximately 1.0 for the different organisms. Each of these organisms contain a double stranded genome. The percentage of Guanine and Cytosine are almost equal to each other, similarly the percentages of Adenine and Thymine are almost equal to each other as well. In other words, the percentage of purines should be equal to the percentage of pyrimidines for double stranded DNA. This means that
    (A + G) = (C + T)
    The (A + T)/ (C + G) ratios are not constant for all the species The relative numbers of (A + T) base pairs and (G + C) base pairs are unique to each organism and can vary between the different species.

  1. In double helix of DNA, the two DNA strands are








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    The two chains comprising the DNA are sprially coiled around a common axis to form a regular, right handed double helix.

    Correct Option: A

    The two chains comprising the DNA are sprially coiled around a common axis to form a regular, right handed double helix.