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 pyrimidines and purines.

  • Ans 1: Pyrimidines: Pyrimidines are nitrogenous bases present in nucleic acids,having only single ringed structure which is only six cornered.
    Examples: Cytosine,Thymine and uracil.
  • Ans 2: Purines: Purines are another type of nitrogenous bases present in nuclei acids having double ringed structure. One ring issoc cornered while second is of five cornered.
    Example: Adenine & Guanine.
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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 pyrimidines and purines.

  • Ans 1: Pyrimidines: Pyrimidines are nitrogenous bases present in nucleic acids,having only single ringed structure which is only six cornered.
    Examples: Cytosine,Thymine and uracil.
  • Ans 2: Purines: Purines are another type of nitrogenous bases present in nuclei acids having double ringed structure. One ring issoc cornered while second is of five cornered.
    Example: Adenine & Guanine.
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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 function of RNA polymerases in transcription?

  • Ans 1: The function of RNA polymerases are as
  • Ans 2: RNA polymerase -i synthesize rRNA
    RNA polymerase -ii synthesize mRNA
    RNA polymerase -iii synthesize tRNA.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 4

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 5

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 6

Question # 1

What is the difference between R, and S, type of bacteria?

  • Ans 1: R From: The mutant from of streptococcus pneumoniae bacteria,which lacks an enzyme needed to manufacture the polysaccharide coat is called the R form because it forms R colonies.On growth medium.
  • Ans 2: S From: The normal pathogenic form of streptococcus pneumoniae bacteria is referred as the S from because it forms smooth colonies on a culture dish.
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12th Class Biology Chapter 20 Short Questions

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