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 point mutation? Give two examples.

  • Ans 1: Point mutation are mutational changes that affects the message itself,producing alterations in the sequence of DNA nucleotides. If alteration involves mutations.For example sickle cell anemia and phenylketonuria.
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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

What is point mutation? Give two examples.

  • Ans 1: Point mutation are mutational changes that affects the message itself,producing alterations in the sequence of DNA nucleotides. If alteration involves mutations.For example sickle cell anemia and phenylketonuria.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 2

Question # 1

Define leading and lagging strand of DNA.

  • Ans 1: Lagging strand is that strand of DNA which is discontinuously synthesized while the strand of DNA which is continuously synthesized is called leading strand.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 3

Question # 1

Write role of DNA ligase.

  • Ans 1: The function of DNA ligase is to fill the nicks (small gaps) or to join the Okazaki fragments to make a continuous strand of DNA.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 4

Question # 1

What is tRNA? Give its role.

  • Ans 1: tRNA is a type of RNA which is 70 to 90 nucleotides in length. It transfers amino acids during the protein synthesis to the place where protein is synthesized in the cell.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 5

Question # 1

Differentiate between codon and anticodon.

  • Ans 1: Codon: Codon is sequence of three nucleotides present on mRNA and specifies an amino acid.
    For Example codon for methionine is AUG.
  • Ans 2: Anti Codon: Anticodon is the sequence of three nucleotides present on tRNA,anti codon of metionine is UAC.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 6

Question # 1

Enlist non sense codons and their function.

  • Ans 1: Non sense condons do not specifiy any amino acid. They are used to terminate or to stop the protein synthesis.Their names are UAA,UGA and UGA.
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12th Class Biology Chapter 20 Short Questions

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