Q22 of 71 Page 36

If Meselson and Stahl's experiment is continued for four generations in bacteria, the ratio of N15/N15: N15/N14: N14/N14 containing DNA in the fourth generation would be:

After 60 minutes or third generation, bacteria has 25 % hybrid (15N 14N) IN 1:3. After 80 minutes or fourth generation bacteria has 12.5% hybrid in 1:7.

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20

While analysing the DNA of an organism a total number of 5386 nucleotides were found out of which the proportion of different bases were: Adenine = 29%, Guanine = 17%, Cytosine = 32%, Thymine = 17%. Considering the Chargaff’s rule, it can be concluded that:

 21

In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called:

 23

If the sequence of nitrogen bases of the coding strand of DNA in a transcription unit is: 5' - A T G A A T G - 3', the sequence of bases in its RNA transcript would be;

 24

The RNA polymerase holoenzyme transcribes: