12 Class Fsc Part 2 Short Questions Online Preparation of biology chapter 20 (Chromosoms and DNA)

Online Short Questions For Chapter 6 "12th Class Biology Chapter 20 Short Questions Preparation "

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Biology - 12th Class Biology Chapter 20 Short Questions Preparation

Question # 1

Differentiate between conservative and dispersive replication of DNA.

  • Ans 1: Conservative Replication: Conservative replication stated that the parental strands would remain intact and generate DNA copies consisting of entirely new molecules.
  • Ans 2: Dispersive Replication: Dispersive model states that parental DNA would become completely dispersed and that each strand of all the daughter molecules would become mixture of old and new DNA.
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Prepare Complete Set Wise Questions For Chapter 6 "12th Class Biology Chapter 20 Short Questions Preparation "

12th Class Biology Chapter 20 Short Questions Preparation - Set 1

Question # 1

Differentiate between conservative and dispersive replication of DNA.

  • Ans 1: Conservative Replication: Conservative replication stated that the parental strands would remain intact and generate DNA copies consisting of entirely new molecules.
  • Ans 2: Dispersive Replication: Dispersive model states that parental DNA would become completely dispersed and that each strand of all the daughter molecules would become mixture of old and new DNA.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 2

Question # 1

What is Semi-Conservative Model of DNA Replication?

  • Ans 1: In semi conservative replication,the two strands of the duplex separates out each acting as a model or mold,along which new nucleotides are arranged thus giving rise to two new duplexes.In this process,by separation of two strands,primary structure has been conserved, whereas the secondary structure has been disrupted.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 3

Question # 1

What is universality of genetic code?

  • Ans 1: It mean it is same for all the organisms.Because of the universality of codon the genes can be transferred from one organism to another and successfully transcribed and translated in their new host.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 4

Question # 1

Define transformation. Name the scientist who worked upon it?

  • Ans 1: When the DNA of donor is transferred into recipient cell it brings changes into genetic material of the recipient cell, It is called transformation. Fredrick Griffth first of all performed experiments on it.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 5

Question # 1

Define transcription.

  • Ans 1: Syntheis of mRNA from the DNA is called transcription.It is first step of central dogma.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 6

Question # 1

What is meant by promoter?

  • Ans 1: A specific nucleotide sequence to which RNA polymerase attaches and initiate transcription of mRNA from a gene.
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12th Class Biology Chapter 20 Short Questions

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