During DNA packaging in eukaryotic cells, Non Histone Chromosomal proteins:
1. Are not required
2. Are required from the beginning to the end of packaging
3. Are required only for earlier stages of packaging
4. Are required for higher level of packaging
1. Are not required
2. Are required from the beginning to the end of packaging
3. Are required only for earlier stages of packaging
4. Are required for higher level of packaging
Frederick Griffith discovered:
(1) DNA is the genetic material
(2) RNA can be the genetic material
(3) Sterptococcus has two strains
(4) Bacterial transformation
In Avery, Macleod and McCarty experiment, the transformation of bacteria was inhibited by:
(1) Proteases
(2) RNase
(3) DNase
(4) None of these
Viruses grown on radioactive sulfur contain:
(1) Radioactive proteins but not DNA
(2) Radioactive DNA but not proteins
(3) Radioactive proteins and DNA
(4) Nonradioactive DNA and protein
Hershey and Chase proved DNA as the genetic material as in their experiment:
(1) Bacteria that were infected with viruses that had radioactive proteins were not radioactive
(2) Bacteria that were infected with viruses that had radioactive DNA were radioactive
(3) Both 1 and 2 are correct
(4) Both 1 and 2 are incorrect
RNA is not the genetic material in:
1. Tobacco mosaic virus
2. QB bacteriophage
3. HIV
4. Archaebacteria
DNA is structurally and chemically more stable than RNA because of all the following except:
(1) It has thymine instead of uracil
(2) 2’ –OH is absent in DNA
(3) It replicates itself based on complementary base pairing
(4) It does not have any catalytic role
The protein synthesizing machinery of a cell has evolved around:
(1) DNA
(2) RNA
(3) Protein itself
(4) Viroids
Who proposed semi-conservative mode of replication for DNA?
(1) Watson and Crick
(2) Meselson and Stahl
(3) Hershey and Chase
(4) Beadle and Tatum
What radioactive isotope was use by Meselson and Stahl to label DNA in their experiment?
1. 35 S
2. 15 N
3. 32 P
4. None
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