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

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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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

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 Preparation - Set 2

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 3

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 4

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 5

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 6

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

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