CSIR NET Life Sciences December 2008 Paper (Part 12 of 14)

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  1. Mucous which covers the epithelial lining of stomach and protects it form protease activity is secreted by

    1. Goblet cells

    2. Parietal cells

    3. Microvilli

    4. Aciner cells

  2. In a population with two alleles ‘b’ and ‘B’ having allele frequency 0.7 and 0.3 in Hardy Weinberg equilibrium, how many individuals in a sample of 250 can be expected to be heterozygous (bB)?

    1. 52

    2. 105

    3. 21

    4. 42

  3. Starling birds orient themselves by sunlight during migration. If they are kept in capativity with artificial light source form one direction, then

    1. They will stop migration

    2. They will orient toward light source

    3. They will orient themselves with change in 150 angle every hour from direction of light

    4. Moves all around the artificial light

  4. Maximum density of dopamine and noradregenic receptor occurs at

    1. Cerebellum

    2. Cerebellem

    3. Medulla oblangata

    4. Spinal cord

  5. Chitin occurs in cell wall of

    1. Bacteria

    2. Arthropods

    3. Fungus

    4. Mollusck

  6. The emergence of polarity of an embryo is the result of

    1. Positive and negative charges interacting in early development.

    2. cytoplasmic differences between cells.

    3. cytoplasmic determinants within cells.

    4. All of the above

  7. Which anticancerous drug is obtained from Catharanthus roseus?

    1. Taxol

    2. Vincristine

    3. Colchicine

    4. Serpentine

  8. The principle for formation of image in phase contrast microscopy

    1. interference of light waves

    2. Negative staining of object

    3. Use of fluorscent probes

    4. Enhancing contrast by differentiating the change in phase of light passed through specimen coming from an angle of cone of light entering through objective lens.

  9. Yeast with petite colony when crossed with wild type generates no petite colony. The most proable mode of inheritence is

    1. Chloroplast

    2. Mitochondria

    3. Episomal

    4. Nuclear

  10. An oligonucleotide DNA sequence tagged with fluroscent tag used to identify unknown gene by hybridisation is termed as

    1. Probe

    2. Reporter gene

    3. Ligand

    4. C-DNA

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