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 tRNA? Give its role.

  • Ans 1: tRNA is a type of RNA which is 70 to 90 nucleotides in length. It transfers amino acids during the protein synthesis to the place where protein is synthesized in the cell.
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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

What is tRNA? Give its role.

  • Ans 1: tRNA is a type of RNA which is 70 to 90 nucleotides in length. It transfers amino acids during the protein synthesis to the place where protein is synthesized in the cell.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 2

Question # 1

Differentiate between chromosome and nucleosome.

  • Ans 1: Chromosome: Chromosome are thread like structures which appear inside the nucleus at the time of cell division. They are.composed of DNA and protein. They carry the genes on them.
  • Ans 2: Nucleosomes: 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 3

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 4

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 5

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 6

Question # 1

Differentiate between heterochromatin and euchromatin.

  • Ans 1: Heterochromatin:Highly condensed part of chromatin is called heterochromatin. This part remains permanently condensed and never be expressed.
  • Ans 2: Euchromatin:The part of chromatin other than heterochromatin is called euchromatin. It condenses only during cell division,when compact packaging facilitates the movement of chromosomes.
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12th Class Biology Chapter 20 Short Questions

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