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

Enlist initiation codon and non-sense codons.

  • Ans 1: Initiation codon is Aug and non sense condons are UAA,UAG and UGA.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 1

Question # 1

Enlist initiation codon and non-sense codons.

  • Ans 1: Initiation codon is Aug and non sense condons are UAA,UAG and UGA.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 2

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 Preparation - Set 3

Question # 1

What is nucleosome? Or Define nucleosome.

  • Ans 1: The DNA duplex is coiled around eight histone proteins forming a complex known as a nucleosome. It appears like beads on a string.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 4

Question # 1

What is phosphodiester bond? How it is formed?

  • Ans 1: The reaction between phosphate group of one nucleotide and hydroxyl group of another is a dehydration synthesis,eliminating a water molecule and forming a covalent bond between two groups. This linkage is called a phosphodiester bond.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 5

Question # 1

Differentiate between sense and anti sense strands of DNA.

  • Ans 1: Sense strand; The strand of DNA which is opposite to the antisense strand and is not transcribe is known as sense strand or coding strand.
  • Ans 2: Anti-sense strand: Only one of the two strands of DNA are transcribed. This strand is called template strand or the antisense strand
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12th Class Biology Chapter 20 Short Questions Preparation - Set 6

Question # 1

What is phosphodiester bond? How it is formed?

  • Ans 1: The reaction between phosphate group of one nucleotide and hydroxyl group of another is a dehydration synthesis,eliminating a water molecule and forming a covalent bond between two groups. This linkage is called a phosphodiester bond.
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12th Class Biology Chapter 20 Short Questions

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