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 "

Try The Short Questions For 12th Class Biology Chapter 20 Short Questions Preparation

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Biology - 12th Class Biology Chapter 20 Short Questions Preparation

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 1

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 2

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 3

Question # 1

What is mutation? Give its name of two classes.

  • Ans 1: Changes in the DNA occur either due to mistake in replication or damage to the genetic message is known as mutations. its classes are:
    1- Point mutations 2- Chromosomal aberrations.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 4

Question # 1

Differentiate between transcription and replication.

  • Ans 1: Transcription: Transcription is the process in which RNA is synthesized from DNA.
  • Ans 2: Replication: Replication is the process in which an exact copy of a molecule is produced.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 5

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 6

Question # 1

What is phosphodiester linkage?

  • Ans 1: The reaction between the phosphate group of one nucleotide and the hydroxyl group of another is dehydration synthesis,eliminating water molecule and forming a covalent bond that links the two groups is called phosphodiester bond.
Submit

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12th Class Biology Chapter 20 Short Questions

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