Question

Observe the given following diagram and answer the following question
(I)Identify the given diagram
(ii) DNA has two parallel threads, what is this structure called?
(iii) From which substance each rail of DNA ladder is made up of ?
(iv) name nitrogenous bases
(v) complete the correction
Adenine:Thymine::_________: cytosine. ​

Answer 1

Answer:

Answer

a) Two strands of DNA are shown in the diagram. The two linear strands form the double strands of DNA.

b) Each strand has two nucleotides. The nucleotide is a structure comprising of a nucleoside and a phosphate group linked to it. Nucleoside comprises of a nitrogenous base and a ribose sugar linked together.

c) The part named "1" is a phosphate group, the part named "2" is a ribose sugar. the part named "3" is a pyrimidine, the part named "4" is hydrogen bond which links the pyrimidine and purine. The part named '5" is purine.

d) The part 1 is a phosphate group, the part 2 is a ribose sugar and the part 3 is a nitrogenous base and hence they collectively constitute Nucleotide.