1
Question
The following figure shows
The following figure shows
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Solution
The correct option is B Watson—Crick model for semiconservative DNA replication
Watson—Crick model for semiconservative DNA replication
1) The given figure shows Watson-Crick model for semiconservative DNA replication.
2) Watson and Crick gave the model for the structure of DNA and stated that it is a double stranded molecule in which the strands are coiled in a helical fashion, as is shown in the diagram.
3) According to the Watson-Crick model for semiconservative DNA replication, the DNA replicates by unwinding of the strands in the double helix.
4) Each strand serves as the template for replication and their complementary strands are newly synthesised.
5) Thus, in each round of replication, the daughter DNA molecules are composed of a newly synthesised strand and and old parental strand, as is seen in the diagram. This is known as semi conservative replication of DNA.
Meselson and Stahl’s experiment
Meselson and Stahl experimentally proved the semi conservative nature of DNA replication in Escherichia coli using radioactive N15 isotopes of nitrogen.
The given diagram does not represent the experiment.
Taylor’s experiment
Taylor and his coworkers demonstrated the semiconservative nature of DNA replication in the root tip cells of Vicia faba by growing the roots in a medium containing radioactive thymidine. The given diagram does not represent the experiment.
Transcription in bacteria
Occurrence of transcription is indicated by the formation of a transcription bubble which is formed due to local unwinding of the DNA strand to allow the RNA polymerase to come and attach to the template strand.
Final answer
(A) Watson—Crick model for semiconservative DNA replication
Watson—Crick model for semiconservative DNA replication
1) The given figure shows Watson-Crick model for semiconservative DNA replication.
2) Watson and Crick gave the model for the structure of DNA and stated that it is a double stranded molecule in which the strands are coiled in a helical fashion, as is shown in the diagram.
3) According to the Watson-Crick model for semiconservative DNA replication, the DNA replicates by unwinding of the strands in the double helix.
4) Each strand serves as the template for replication and their complementary strands are newly synthesised.
5) Thus, in each round of replication, the daughter DNA molecules are composed of a newly synthesised strand and and old parental strand, as is seen in the diagram. This is known as semi conservative replication of DNA.
Meselson and Stahl’s experiment
Meselson and Stahl experimentally proved the semi conservative nature of DNA replication in Escherichia coli using radioactive N15 isotopes of nitrogen.
The given diagram does not represent the experiment.
Taylor’s experiment
Taylor and his coworkers demonstrated the semiconservative nature of DNA replication in the root tip cells of Vicia faba by growing the roots in a medium containing radioactive thymidine. The given diagram does not represent the experiment.
Transcription in bacteria
Occurrence of transcription is indicated by the formation of a transcription bubble which is formed due to local unwinding of the DNA strand to allow the RNA polymerase to come and attach to the template strand.
Final answer
(A) Watson—Crick model for semiconservative DNA replication
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