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

Compare telocentric and acrocentric chromosomes.

  • Ans 1: Telocentric Chromosomes:Telocentric has centromere at one end and chromatid part is present at other end.
  • Ans 2: Acrocentric Chromosomes: Acrocentric has two unequal arms one is short and other is long.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 1

Question # 1

Compare telocentric and acrocentric chromosomes.

  • Ans 1: Telocentric Chromosomes:Telocentric has centromere at one end and chromatid part is present at other end.
  • Ans 2: Acrocentric Chromosomes: Acrocentric has two unequal arms one is short and other is long.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 2

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 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 point mutation? Give two examples.

  • Ans 1: Point mutation are mutational changes that affects the message itself,producing alterations in the sequence of DNA nucleotides. If alteration involves mutations.For example sickle cell anemia and phenylketonuria.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 5

Question # 1

What is role of promoter is transcription?

  • Ans 1: Promoter is responsible for the correct initiation of transcription process.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 6

Question # 1

What is universality of genetic code?

  • Ans 1: It mean it is same for all the organisms.Because of the universality of codon the genes can be transferred from one organism to another and successfully transcribed and translated in their new host.
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12th Class Biology Chapter 20 Short Questions

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