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 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 Preparation - Set 1

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 Preparation - Set 2

Question # 1

How is newly synthesized mRNA protected after transcription?

  • Ans 1: A cap and tail is added so that molecule may remain stable during its travelling to cytoplasm. The cap is in the form of 7-methyl GTP where as tail is in the form of poly A tail linked to 3 end of the RNA.These cap and tail protects RNA from action of enzymes.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 3

Question # 1

How many DNA polymerases are found in prokaryotes? Write their names.

  • Ans 1: There are three DNA polymerases namely I,II and III in bacteria.
    i) DNA polymerase I ii) DNA polymerase II iii) DNA polymerase III
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12th Class Biology Chapter 20 Short Questions Preparation - Set 4

Question # 1

Give the functions of the DNA polymerase III.

  • Ans 1: DNA polymerase III progressively threads the DNA through the enzyme complex,moving at rapid rate,some 1000 nucleotides/second.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 5

Question # 1

What are Okazaki fragments? Also give their length.

  • Ans 1: During replication of DNA,one of its strands is discontinuously synthesized in the form of fragments called Okazaki fragments.Its length in eukaryotes is 100 to 200 nucleotides while in prokaryotes it is 1000 to 2000 nucleotides.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 6

Question # 1

Describe chromosomal aberrations.

  • Ans 1: Chromosomal aberrations are mega changes which involve presence of an extra chromosome or loss of a chromosome from the diploid number of chromosomes or changes like addition,insertion,inversion and duplication.
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12th Class Biology Chapter 20 Short Questions

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