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प्रश्न
Answer the following question in your own words.
Describe the structure of the DNA molecule.
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उत्तर
- All organisms have the same DNA structure. Watson and Crick modelled DNA in 1953. In this model, two parallel nucleotide threads coil around each other. A ‘double helix’ describes this arrangement. Like a coiled ladder, its construction is flexible.
- The DNA strands include many tiny ‘nucleotide’ molecules. Four nitrogenous bases are adenine, guanine, cytosine, and thymine. Cytosine and thymine are pyrimidines and adenine and guanine are purines.
- A nitrogenous base, phosphoric acid, and sugar molecule form the nucleotide.
- Four types of nitrogenous bases equal four types of nucleotides.
- DNA has a chain of nucleotides. Each ladder rail is constructed of alternately connected sugar and phosphoric acid molecules, like the DNA molecule's two threads. Every ladder step is two nitrogenous bases connected by hydrogen bonds. Adenine always connects with thymine, cytosine with guanine.
Structure of DNA
DNA (Watson and Crick’s Model)
APPEARS IN
संबंधित प्रश्न
Name the enzyme and state its property that is responsible for continuous and discontinuous replication of the two strands of a DNA molecule
Correct the following statement by changing the underlined word:
Nitrogen bonds are present between the complementary nitrogenous bases of DNA.
Correct the following statement if there is any mistake.
The four nitrogenous bases in the DNA are Guanine, Thiamine, Adrenaline and Cytosine.
Answer the following question in your own words.
Express your opinion about the use of DNA fingerprinting.
Write a sentence of the following:
Chromonemata
State whether the following sentence is true or false:
The two DNA chains are parallel to each other.
Choose the correct answer :
DNA model was given by ___________
Choose the correct answer :
Adenine is a __________
Choose the correct answer :
RNA has uracil instead of ____________
Write the functional activity of the following structure:
DNA
Multiple Choice Question:
In the RNA molecule, which nitrogen base is found in place of thymine?
The ______ units form the backbone of the DNA.
What is the name given to the segments of DNA, which are responsible for the inheritance of a particular character?
How is the structure of DNA organized?
What is the biological significance of DNA?
____________ were used by Friedrich Miescher for his experiments.
Through which of the following experiments DNA was proved to be the genetic material in E. coli and bacteriophage?
A nucleoside differs from a nucleotide in not having a ______.
