The type of linkage present between nucleotides is

Identify the set containing purine and pyrimidine base of $DNA$ respectively.

Given below are two statements:
Statement $I$: $A$ unit formed by the attachment of a base to $1'-$position of sugar is known as nucleoside.
Statement $II$: When nucleoside is linked to phosphorous acid at $5'-$position of sugar moiety,we get nucleotide.
In the light of the above statements,choose the correct answer from the options given below:

What is the unit consisting of a base,sugar,and phosphate in nucleic acids called?

Which of the following sequences is correct in a nucleic acid?

Given below are two statements:
Statement $I$: Cytosine and guanine are formed in equal quantities in $DNA$ hydrolysis.
Statement $II$: Adenine and uracil are formed in equal quantities in $RNA$ hydrolysis.
The correct answer is: