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

Define central Dogma.

  • Ans 1: Central Dogma means all the organisms use the same basic mechanism of gene expression which is referred to as Central Dogma.
  • Ans 2: Central Dogma consists of two steps
    a) Transcription:synthesis of mRNA from DNA
    b) Translation: Synthesis of protein from mRNA.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 1

Question # 1

Define central Dogma.

  • Ans 1: Central Dogma means all the organisms use the same basic mechanism of gene expression which is referred to as Central Dogma.
  • Ans 2: Central Dogma consists of two steps
    a) Transcription:synthesis of mRNA from DNA
    b) Translation: Synthesis of protein from mRNA.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 2

Question # 1

Give the chemical composition of RNA.

  • Ans 1: RNA is composed of nitrogen bases (adenine.guanine,cytosine and uracil),pentose sugar(ribose) and phosphate group.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 3

Question # 1

Differentiate between transcription and translation.

  • Ans 1: Transcription: it is the first step of protein synthesis,in transcription mRNA is synthesized from DNA.
  • Ans 2: Translation: It is the second step of protein synthesis in which DNA message for protein synthesis is decoded and polypeptide chain is synthesized.
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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 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 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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