Home
Class 12
CHEMISTRY
The image below shows the double helix s...

The image below shows the double helix structure of a DNA.

(i) The double helix structure is easily destroyed by change in (a) temperature and (b) pH value. Explain the reason for both the cases.
(ii) Suppose the bonds holding the DNA strands for double helix together were (a) covalent bonds (b) London dispersion force. What would be the problem in each case?

Promotional Banner

Topper's Solved these Questions

  • QUESTION BANK 2021

    CBSE MODEL PAPER|Exercise Multiple Choice Questions|72 Videos

Similar Questions

Explore conceptually related problems

In double strand helix structure of DNA, heterocyclic base cytosine forms hydrogen bond with

In double helix structure of DNA hydrogen bonding present between bases. The correct base pair is

Formation OF phosphodiester bonds || Nucleic acids (DNA & RNA) || Double Helix Structure OF DNA

Formation OF Phosphodiester Bonds || Nucleic Acids (DNA & RNA ) || Double Helix Structure OF DNA

(a) What is denaturation of proteins? (b) What type of bonds hold a DNA double helix together? (c) Which enzyme is present in saliva? What is its function?

Assertion: The two strands in double strand helix structure of DNA are complementary to each other Reason: Disulphide bonds are formed between SQPecific pairs of bases

Which of the following bonds are present in a DNA double helix ? a. Hydrogen bond b. Peptide bond c. Glycosidic bond d. Phosphodiester bond

Which statement/s is/are incorrect regarding DNA ? I. DNA has a double helix structure. II. DNA can be double-stranded or single-stranded in animals III. The two chains have parallel polarity. IV. The pitch of the helix is 3.4 nm.

CBSE MODEL PAPER-Additional Practice Questions-Question
  1. Pineapple contains a protease enzyme that breaks down proteins. If you...

    Text Solution

    |

  2. The chain structure of Lysine is shown below. (i) Based on the st...

    Text Solution

    |

  3. 2-bromooctane reacts with alcoholic NaOH to give 2-octanol as shown be...

    Text Solution

    |

  4. (a) Which of the following two compounds has a chiral centre? (b)...

    Text Solution

    |

  5. (i) The complex [PtCl2(NH3)2] has two isomers whereas [CoCl4]^(2-) doe...

    Text Solution

    |

  6. The half equation for a redox reaction represents an equilibrium betwe...

    Text Solution

    |

  7. A first order reaction is found to have a half-life of 1.15 times 10^4...

    Text Solution

    |

  8. Esterification of a carboxylic acid with an alcohol in the presence of...

    Text Solution

    |

  9. (a) Is benzaldehyde less or more reactive to electrophilic substitutio...

    Text Solution

    |

  10. In 20th century, German scientist Werner succeeded in clarifying the s...

    Text Solution

    |

  11. Suman took two glasses of water from a water filter. She cools one gla...

    Text Solution

    |

  12. The image below shows the effect of acid and base on the aqueous ethyl...

    Text Solution

    |

  13. A mixture of 0.5 moles acetaldehyde and 0.5 moles diethyl ketone is tr...

    Text Solution

    |

  14. (a) Show steps to convert nitrobenzene to phenol. (b) The table belo...

    Text Solution

    |

  15. The image below shows the double helix structure of a DNA. (i) Th...

    Text Solution

    |

  16. During a titration, 240 ml of NaOH reacted completely with 100 ml of H...

    Text Solution

    |

  17. One of the most common cells that's been used in our daily life is Dur...

    Text Solution

    |

  18. Imagine you are in a chemistry lab and the teacher is explaining the e...

    Text Solution

    |

  19. The image below shows the boiling point of first seven straight chain ...

    Text Solution

    |

  20. (i) Write the outer shell electronic configuration of an element with ...

    Text Solution

    |