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 semi conservative replication and conservative replication.

  • Ans 1: Semi Conservative Replication: The two strands of double helix of DNA separate out acting as a model or template,along which new nucleotide are arranged thus giving rise to two new DNA duplexes.
  • Ans 2: Conservative Replication: This model states that the parental double helix would remain intact and generate DNA copies consisting of entirely new molecule.
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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 semi conservative replication and conservative replication.

  • Ans 1: Semi Conservative Replication: The two strands of double helix of DNA separate out acting as a model or template,along which new nucleotide are arranged thus giving rise to two new DNA duplexes.
  • Ans 2: Conservative Replication: This model states that the parental double helix would remain intact and generate DNA copies consisting of entirely new molecule.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 2

Question # 1

what is a phosphodiester bond?

  • Ans 1: The reaction between the phosphate group of one nucleotide and the hydroxyl group of another is a dehydration synthesis,eliminating a water molecule and forming covalent bond that links the two groups.The linkage is called a phosphodiester bond.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 3

Question # 1

What is role of promoter is transcription?

  • Ans 1: Promoter is responsible for the correct initiation of transcription process.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 4

Question # 1

Briefly describe replication of lagging strand of DNA.

  • Ans 1: Lagging strand replicates away from the replication fork. It is synthesized discontinuously as a series of short segments that are later connected.These fragments are called Okzaki fragmernts.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 5

Question # 1

Give chromosomal theory of inheritance.

  • Ans 1: According to this theory,genes are located on chromosomes. At the time of cell division all the genes which are present on a chromosome,will go to same cell in which cell chromosome is transported.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 6

Question # 1

Differentiate between template and coding stands of DNA.

  • Ans 1: Template Strand: The strand of DNA which is transcribed is called template strand or antisense strand.
  • Ans 2: Coding Strand: The Strand of DNA which is not transcribed is called coding strand or sense strand.
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12th Class Biology Chapter 20 Short Questions

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