12-botany- Unit - III & IV Cell Biology And Genetics, Biotechnology

26 Questions

Settings
Please wait...
12-botany- Unit - III & IV Cell Biology And Genetics,  Biotechnology

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

      Waldeye

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

      Oenothera lamarckiana

    • B. 

      Sorghum

    • C. 

      Neurospora

    • D. 

      Cicer gigas

  • 5. 
    Recombination of chromosome takes place in _____ stage of prophase I of meiosis.  
    • A. 

      Pachytene

    • B. 

      Diplotene

    • C. 

      Leptotene

    • D. 

      Zygotene

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

      Neurospora

    • B. 

      Sorghum

    • C. 

      Cicer arietinum

    • D. 

      Cicer gigas

  • 7. 
    The gametes of Drosophila melanogaster carry  
    • A. 

      Four chromosomes

    • B. 

      three chromosomes

    • C. 

      Seven chromosomes

    • D. 

      Eight chromosomes

  • 8. 
    Nullisomy is represented by  
    • A. 

      2n – 2.

    • B. 

      2n + 2

    • C. 

      2n – 1

    • D. 

      2n + 1

  • 9. 
    The width of DNA molecule is  
    • A. 

      20 Å

    • B. 

      18 Å

    • C. 

      34 Å

    • D. 

      35 Å

  • 10. 
    Double helix DNA model was proposed by _____  
    • A. 

      Watson and Crick

    • B. 

      O.T. Avery et al

    • C. 

      Griffith

    • D. 

      Stinberg

  • 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. 

      20 - 30%

    • C. 

      10 - 20%

    • D. 

      5 - 10%

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

      70

    • B. 

      200

    • C. 

      300

    • D. 

      400

  • 14. 
    Restriction enzymes are synthesized by  
    • A. 

      Bacteria only

    • B. 

      yeast and bacteria only

    • C. 

      eukaryotic cells only

    • D. 

      All kinds of cells

  • 15. 
    Each restriction enzyme cleaves a molecule only at  
    • A. 

      nucleotide sequence

    • B. 

      The time of DNA replication

    • C. 

      Methyl groups

    • D. 

      the ends of genes

  • 16. 
    One of the following process is employed to introduce a foreign gene into a cell  
    • A. 

      Electroporation

    • B. 

      Electrolysis

    • C. 

      Plasmid

    • D. 

      ligation

  • 17. 
    The number of transgenic plants available to-day are approximately  
    • A. 

      fifty

    • B. 

      twelve

    • C. 

      six

    • D. 

      Two

  • 18. 
    A toxic protein called delta endotoxin is insecticidal and it is produced by  
    • A. 

      Bacillus thuringiensis

    • B. 

      Bacillus lactii

    • C. 

      Escherichia coli

    • D. 

      Streptomyces griseus

  • 19. 
    Pseudomonas putida is a engineered bacterium that can  
    • A. 

      Digest crude oil slick

    • B. 

      Produce a hormone

    • C. 

      Produce a antibiotic

    • D. 

      Pollute the soil

  • 20. 
    The inherent potential of any living plant cell to develop into entire organism is called  
    • A. 

      totipotency

    • B. 

      Morphogenesis

    • C. 

      Differentiation

    • D. 

      Organogenesis

  • 21. 
    The function of cytokinin is to increase  
    • A. 

      Cell division

    • B. 

      Cell elongation

    • C. 

      Differentiation

    • D. 

      fruit initiation

  • 22. 
    By the application of tissue culture, one important product is formed  
    • A. 

      Artificial synthetic seeds

    • B. 

      Many seeded fruit

    • C. 

      triploid endosperm

    • D. 

      Induction of flowers

  • 23. 
    The two protoplasts are fused with a fusogen called  
    • A. 

      Polyethylene glycol (PEG)

    • B. 

      Polyvinyl chloride (PVC)

    • C. 

      Polyethane glycol (PEG)

    • D. 

      Phosphoric ethane

  • 24. 
    Somatic hybrids are produced through  
    • A. 

      Protoplasmic fusion

    • B. 

      Asexual fusion

    • C. 

      Vegetative propagation

    • D. 

      Grafting

  • 25. 
    One of the following organism is a SCP  
    • A. 

      Spirulina

    • B. 

      Nostoc

    • C. 

      Rhizobium

    • D. 

      Mushroom

  • 26. 
    Enriched vitamin tablets are produced from the following organism for human consumption  
    • A. 

      Spirulina

    • B. 

      Mushroom

    • C. 

      Nostoc

    • D. 

      yeast