12-bio-botany-unit-III Cell Biology And Genetics

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12-bio-botany-unit-III Cell Biology And Genetics

Prepared by Mr. D. Rajamani, M. Sc. ,M. Ed. , P. G. Asst Botany A. C. S Mat. Hr Sec. School, Arni. Tiruvannamalai Dist & www. Padasalai. Net


Questions and Answers
  • 1. 
    The term chromosome was introduced by
    • A. 

      Waldeyer

    • B. 

      Bridges

    • C. 

      Balbiani

    • D. 

      Flemming

  • 2. 
    Who had first proved that the genes are carried by the chromosome?
    • A. 

      Bridges

    • B. 

      Waldeyer

    • C. 

      Balbiani

    • D. 

      Flemming

  • 3. 
    The coupling test cross ratio is
    • A. 

      7:1:1:7

    • B. 

      1:7:7:1

    • C. 

      1:1:1:1

    • D. 

      9:3:3:1

  • 4. 
    Recombination of chromosome takes place in _____ stage of prophase I of meiosis.
    • A. 

      Pachytene

    • B. 

      Leptotene

    • C. 

      Zygotene

    • D. 

      Diplotene

  • 5. 
    Hugo de Vries first used the term mutation based on his observation on
    • A. 

      Oenothera lamarckiana

    • B. 

      Sorghum

    • C. 

      Neurospora

    • D. 

      Cicer gigas

  • 6. 
    Biochemical mutants of _____ failed to synthesize certain amino acids.
    • A. 

      Neurospora

    • B. 

      Sorghum

    • C. 

      Cicer arietinum

    • D. 

      Cicer gigas

  • 7. 
    Nullisomy is represented by
    • A. 

      2n – 2

    • B. 

      2n – 1

    • C. 

      2n + 1

    • D. 

      2n + 2

  • 8. 
    The gametes of Drosophila melanogaster carry
    • A. 

      Four chromosomes

    • B. 

      Three chromosomes

    • C. 

      Seven chromosomes

    • D. 

      Eight chromosomes

  • 9. 
    Double helix DNA model was proposed by _____
    • A. 

      Watson and Crick

    • B. 

      O.T. Avery et al

    • C. 

      Griffith

    • D. 

      Stinberg

  • 10. 
    The width of DNA molecule is
    • A. 

      20 Å

    • B. 

      18 Å

    • C. 

      34 Å

    • D. 

      35 Å

  • 11. 
    RNA is universally present in all organisms except in _____
    • A. 

      DNA viruses

    • B. 

      TMV

    • C. 

      Bacteria

    • D. 

      Algae

  • 12. 
    MRNA is about _____ of the RNA content of the cell
    • A. 

      3 - 5%

    • B. 

      10 - 20%

    • C. 

      5 - 10%

    • D. 

      20 - 30%

  • 13. 
    In bacterial cell, there are more than _____ tRNAs
    • A. 

      70

    • B. 

      200

    • C. 

      300

    • D. 

      400