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 "

Try The Short Questions For 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 gene?

  • Ans 1: The sequence of nucleotides that determines the amino acid sequence of a protein is called gene.
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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 gene?

  • Ans 1: The sequence of nucleotides that determines the amino acid sequence of a protein is called gene.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 2

Question # 1

How many chromosomes are present in mouse and sugar cane?

  • Ans 1: Sugar can has 80 while mouse has 40 chromosomes respectively.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 3

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 4

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 5

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 6

Question # 1

Differentiate between heterochromatin and euchromatin.

  • Ans 1: Heterochromatin:Highly condensed part of chromatin is called heterochromatin. This part remains permanently condensed and never be expressed.
  • Ans 2: Euchromatin:The part of chromatin other than heterochromatin is called euchromatin. It condenses only during cell division,when compact packaging facilitates the movement of chromosomes.
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12th Class Biology Chapter 20 Short Questions

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