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 transcription.

  • Ans 1: Syntheis of mRNA from the DNA is called transcription.It is first step of central dogma.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 1

Question # 1

Define transcription.

  • Ans 1: Syntheis of mRNA from the DNA is called transcription.It is first step of central dogma.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 2

Question # 1

Give chromosomal theory of inheritance.

  • Ans 1: According to this theory,genes are located on chromosomes. At the time of cell division all the genes which are present on a chromosome,will go to same cell in which cell chromosome is transported.
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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

Define phenylketonuria. OR What is phenylketonuria?

  • Ans 1: In phenylketonuria,phenylalanine is not degraded because of defective enzyme phenylalanine hydroxylase. Phenylalanine consequently accumulates in the cells leading to mental retardation,as the brain cells fails to develop in infancy.This disorder is due to point mutation.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 5

Question # 1

How is translation terminated?

  • Ans 1: When a chain terminating non sense codon is exposed,this non sense codon do not bind any tRNA but they are recognized by release factor,protein that release the newly made polypeptide from the ribosome.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 6

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

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