Quiz  /  NEET DNA Structure MCQ Quiz

  • 1. 
    DNA fingerprinting recognizes the differences in

  • satellite DNA
  • bulk DNA
  • Repetitive DNA
  • both and

  • 2. 
    This force can stabilize a DNA double-helix

  • Hydrophilic sugar-phosphate groups are found on the exterior of the helix where interaction with water occurs
  • Hydrophobic bases are present in the interior of the helix, each base-pair is stabilized by the same number of hydrogen bonds
  • covalent base stacking interactions may take place between neighbouring bases within the same strand in the helix
  • non-covalent N-glycosidic bonds may form between nitrogenous bases in opposite strands in the helix

  • 3. 
    In this type of DNA replication, of the two newly formed molecules, one is purely a new one and the other is an old one

  • dispersive
  • conservative
  • semiconservative
  • both and

  • 4. 
    The process of DNA replication is affected by an enzyme known as

  • Mutase
  • Ligase
  • Polymerase I
  • Ribonuclease

  • 5. 
    A DNA molecule in which both strands have radioactive thymidine is permitted to replicate in an environment that contains non-radioactive thymidine What is the right number of DNA molecules which possess some radioactive thymidine post three duplications?

  • one such molecule
  • two such molecules
  • four such molecules
  • eight such molecules

  • 6. 
    If the DNA strand has nitrogenous base sequence ATTGCC, the mRNA will have?

  • ATTGCA
  • UGGACC
  • UAACGG
  • ATCGCC

  • 7. 
    The type of coiling in DNA is

  • Zig-zag
  • Left-handed
  • Opposite
  • Right-handed

  • 8. 
    In DNA, the enzyme which breaks the H

  • Ligase
  • Helicase
  • Topoisomerase
  • Polymerase

  • 9. 
    The total DNA comprises what amount of cytoplasmic DNA in cells?

  • 95-99%
  • 65-75%
  • 45-50%
  • 1-5%

  • 10. 
    The bases are held together in a DNA double helix by hydrogen bonds These bonds are

  • Ionic bonds
  • Covalent bonds
  • Non-covalent bonds
  • Van der Waals forces
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