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

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 Preparation - Set 1

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 Preparation - Set 2

Question # 1

Define Mutation.

  • Ans 1: The sudden change in DNA or gene is called mutation.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 3

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 4

Question # 1

What is phosphodiester linkage?

  • Ans 1: The reaction between the phosphate group of one nucleotide and the hydroxyl group of another is dehydration synthesis,eliminating water molecule and forming a covalent bond that links the two groups is called phosphodiester bond.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 5

Question # 1

What is function of RNA polymerases in transcription?

  • Ans 1: The function of RNA polymerases are as
  • Ans 2: RNA polymerase -i synthesize rRNA
    RNA polymerase -ii synthesize mRNA
    RNA polymerase -iii synthesize tRNA.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 6

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

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