NEETChemistryBiomolecules
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Dinucleotides are formed by joining two nucleotides together by phosphodiester linkage between 5' and 3' carbon atoms of the pentose sugar. Reason (R): A nucleotide monomer is formed when a nucleoside is linked to phosphorous acid at the 5' -position of the sugar moiety. In the light of the above s
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- B(A) is correct but (R) is not correct
- CBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- D(A) is not correct but (R) is correct
Correct answer
B. (A) is correct but (R) is not correct
Step-by-step solution
Assertion (A) is correct because dinucleotides are indeed formed by joining two nucleotides through a phosphodiester linkage between the 5' and 3' carbon atoms of the pentose sugar. Reason (R) is incorrect because a nucleotide is formed when a nucleoside is linked to phosphoric acid (not phosphorous acid) at the 5' -position of the sugar moiety. The subtle difference between phosphoric acid ( H ₃ PO ₄ ) and phosphorous acid ( H ₃ PO ₃ ) makes the statement false. Answer: (A) is correct but (R) is not correct