CSIR Life Science Sample Questions (Part 1 of 10)

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  1. Which amino acid is involved in purine biosynthesis

    1. Glycine

    2. aspartate

    3. glutamine

    4. all the above

  2. Carbonic acid (H2CO3) ionizes partially in water to form bicarbonate (HCO3-) and H +. What will happen to a solution containing these ions when a small amount of a strong base is added

    1. More of the (H2CO3) will ionize to form (HCO3-)

    2. More of the (HCO3-) will combine with H + to form (H2CO3)

    3. Nothing will change

    4. all the above

  3. Which of the following leads to the decrease in the fluidity in the lipid bilayer

    1. An increase in the unsaturation of the phospholipid fatty acyl chains

    2. Decrease in the amount of cholesterol in bilayer

    3. Increase in the temperature of the bilayer

    4. An increase in the length of fatty acid chain

  4. Na + K + ATPase and SERCA pumps are inhibited by

    1. Tetrodotoxin

    2. Dendrotoxin

    3. Vandate

    4. Bungarotuxin

  5. TH cell is distinguished from Tc cell by the presence of which type of glycoprotein on their surface?

    1. Presence of CD4

    2. Absence of CD4

    3. Presence of MHC-I on the TH cell

    4. None of these

  6. The first Antibody synthesized by the Neonate?

    1. lg G

    2. lg A

    3. lg M

    4. Ig E

  7. In DNA structure ‘propeller trait’ means

    1. two bases orient antiparallel to each other

    2. two bases flip with respect to each other

    3. the bases of DNA base pairs twist with respect to each other

    4. two bases stock with respect to each other with 3.4 Å

  8. Rifampicin resistant mutarts of E. Coli were obtained in an experiment. Which of the following is the most likely to have undergone a mutation

    1. amino-acyl t-RNA synthetase

    2. Sigma factor of RNA polymerase

    3. Beta subunit of RNA polymerase

    4. Alpha subunit of RNA polymerase

  9. The egg of frog is

    1. Telolecithal

    2. Microlecithal

    3. Centrolecithal

    4. Alecithal

  10. The nature of endosperm in coconut is

    1. Cellular

    2. Helobial

    3. Nucellar

    4. All of these

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