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 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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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 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 2

Question # 1

What are chromosomal aberrations? Give its reasons.

  • Ans 1: Unequal distribution of chromosomes in daughter cell during cell division or any change in the structure of chromosome leads to abnormalities in chromosome in daughter cell,it is called chromosomal aberration.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 3

Question # 1

What is Semi-Conservative Model of DNA Replication?

  • Ans 1: In semi conservative replication,the two strands of the duplex separates out each acting as a model or mold,along which new nucleotides are arranged thus giving rise to two new duplexes.In this process,by separation of two strands,primary structure has been conserved, whereas the secondary structure has been disrupted.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 4

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 5

Question # 1

How is translation terminated?

  • Ans 1: When a chain terminating non sense codon is exposed,this non sense codon do not bind any tRNA but they are recognized by release factor,protein that release the newly made polypeptide from the ribosome.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 6

Question # 1

What is contribution of Erwin chargaff with respect to chemical nature of DNA?

  • Ans 1: He formulated chargaff rule. He proposed that ratio of purines is equal to pyrimidines and ratio of adenine and thymine is equal to guanine and cytosine.
    A+T=G+C
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12th Class Biology Chapter 20 Short Questions

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