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प्रश्न
Which property of DNA double helix led Watson and Crick to hypothesise semi-conservative mode of DNA replication? Explain.
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उत्तर
Watson and Crick proposed a semi-conservative mode of DNA replication based on the molecule’s antiparallel, double-stranded structure. They suggested that the two strands of the DNA molecule uncoil and separate, with each strand serving as a template for the production of a new (complementary) strand alongside it. The template and its complement then combine to generate a new double-stranded DNA molecule identical to the original. The sequence of bases that should be present in the new strands is easily predicted because they will be complementary to the bases present in the old strands. A will partner with T, T with A, C with G, and G with C. As a result, two daughter DNA molecules are created that are identical to the parent molecule; each daughter DNA molecule consists of one new and one old strand. This replication mechanism is referred to as semi-conservation because each daughter molecule contains only one conserved parent strand. Later, experiments by Joseph Taylor, Meselson and Stahl verified it.
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संबंधित प्रश्न
Group the following as nitrogenous bases and nucleosides:
Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine.
One turn of DNA possesses ______.
In some viruses, RNA is present instead of DNA indicating that ______.
In a DNA strand the nucleotides are linked together by ______.
Both deoxyribose and ribose belong to a class of sugars called ______.
The fact that a purine base always paired through hydrogen bonds with a pyrimidine base leads to, in the DNA double helix ______.
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 ______.
What is the nature of the strands of the DNA duplex?
How far is each base pair from the next one in DNA double helix model?
Synthesis of DNA from RNA is explained by ______.
There is no DNA in ______.
A peptide chain assumes secondary structure through the formation of ______.
Which of the following is a purine?
What is the smallest part of a DNA molecule that can be changed by a point mutation?
Polymerase chain reaction (PCR) amplifies DNA following the equation.
What structural difference exists between the pentose sugar found in DNA and the pentose sugar found in RNA?
The phosphate group in a nucleotide is attached to which carbon of the pentose sugar?
The 3′ end of a polynucleotide chain is characterized by the presence of:
In a DNA double helix, where are the nitrogenous bases located?
Why is the name 'deoxyribonucleic acid' appropriate for DNA?
What structural difference exists between the pentose sugar found in DNA and the pentose sugar found in RNA?
The phosphate group in a nucleotide is attached to which carbon of the pentose sugar?
The 3′ end of a polynucleotide chain is characterized by the presence of:
In a DNA double helix, where are the nitrogenous bases located?
Why is the name 'deoxyribonucleic acid' appropriate for DNA?
A dinucleotide is formed by linking two nucleotides together. The bond formed between them is:
