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  4. Refer to the given reactions. I. Guanine +X longrightarrow Guanosine II. Guanosine + Y longrightarrow Guanylic acid

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Q. Refer to the given reactions.
I. Guanine $+X \longrightarrow$ Guanosine
II. Guanosine $+ Y \longrightarrow$ Guanylic acid

Biomolecules

Solution:

Option (b) is correct and can be explained as follows
I. $\underset{\text{(Nitrogen base)}}{\text{Guanine}}$ +$ \underset{\text{(Sugar molecule)}}{X} \longrightarrow \underset{\text{((Nucleoside)}}{\text{Guanosine}}$
II. $\underset{\text{(Nucleoside)}}{\text{Guanine}}$ +$ \underset{\text{(Phosphate group)}}{Y} \longrightarrow \underset{\text{(Nucleotide)}}{\text{Guanylic acid}}$