8/6/2019 ICSE Biology: Chapter 2_Structure of Chromosomes_Questions

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Std: X Biology 2.Structure of Chromosomes (13/5/2011)

Q1. Scientist and their contribution  (1 mark) 

1. Watson and Crick

2. Roselind Franklyn3. E. Strasburger4. Waldeyer5. Balbiani6. Sutton and Boveri7. W. Fleming

Q2. Explain the basic structure of Chromosome with figure (5 marks)

Q3. Classify the chromosome according to the presence of Centromere with figure(5 marks) 

Q4. Explain the DNA structure / Watson and Crick Model of DNA with figure. (5 marks) 

Q5. Explain DNA replication with figure. (5 marks) 

Q4. Short Questions and answers.  (2 marks each) 

1. How many % of DNA is present in Chromosome?2. How many % of Histone proteins are there in Chromosome?3. How many % of Non-Histone proteins are there in Chromosome?4. Name the metallic ions found in traces in Chromosomes?

5. What is Nucleosome?6. How many chromosomes are there in Butterfly, Monkey and in Sugar Cane?7. Define Karyotype and Idiogram?8. Who worked out the structure of DNA?9. What is Dissymmetry ratio?10. Name the enzyme used to join the complimentary DNA pairs?11. State the importance of enzyme Helicase.12. Why DNA replication is called Semi-Conservative replication?13. Name Purines and Pyrimidines.14. Dolly sheep is 1st cloned animal, developed by which technique?15. What is gene manipulation or genetic engineering?

16. Name the pentose sugar found in DNA.17. How many Nucleotides (base pairs) are present in each spiral of the DNA?18. Explain Down’s Syndrome.19. State the function of Telomeres.20. Name the two largest chromosome in the living kingdom.21. Name the chemical used to stop the cell division.22. Which phase is the best phase to observe and study Chromosomes?