The nucleoside composed of adenine with β-D-ribose is called ______.

• Nucleic acids:
The role of nucleic acids is to see how carbohydrates, proteins, and enzymes originate in the cell and how they preserve their structural formation.
Nucleic acids are defined as the long-chain polymers present in high concentrations in the nuclei of cells in which the monomeric units are nucleotides.
The molecules where one of the bases is combined with sugar is called nucleoside.
When a phosphate group is also attached to the nucleoside, it is called a nucleotide.
Nucleic acids are responsible for the biosynthesis of proteins and the transmission of hereditary characters.
There are two types of nucleic acids DNA, RNA.
DNA molecules are very large and are found in the nucleus of the cell.
On the other hand, RNA molecules are much smaller and are found outside the cell.

✅ Explanation:
A heterocyclic nitrogen-containing organic base with a ring structure is called nitrogenous bases.
There are two types of bases present in nucleic acids and they are- purines and pyrimidines.

• The bases derived from purine are:
A. Adenine 
B. Guanine 
The bases derived from pyrimidines are – 
Cytosine
Thymine
Uracil 
The base uracil is present in RNA whereas thymine is present in DNA.

• The purine base adenine has the structure:
When we add a pentose sugar to the nitrogenous base, it becomes a nucleoside.

The nucleoside of adenine is called adenosine and has the structure: