Question

A nitrogenous base is linked to pentose sugar through
A. Hydrogen bond
B. Glycosidic bond
C. Phosphodiester bond
D. Peptide bond

Answer 1

Nitrogenous base is the building block of DNA. They mainly are responsible for winding and denaturing of DNA. Also, they are the life code and provide messages to our cellular system. There are a total of four numbers of bases. It bonds two nucleic acids together.

Complete answer:
Deoxyribonucleic acid is made up of a nitrogenous base, phosphate, and sugar. It has deoxyribose sugar that has hydrogen positioned at second carbon. The sugar is linked to a nitrogenous base at the primary carbon by a glycosidic bond. When a phosphate group is linked to OH of a nucleoside through phosphoester linkage, an associated nucleotide is formed. Two nucleotides are linked through a phosphodiester linkage to form a dinucleotide.
So, the right answer is Option B ( Glycosidic Bond).
Additional Information:-
A glycosidic bond or glycosidic linkage is a kind of covalent bond that joins a carbohydrate (sugar) molecule to a different cluster, which can or cannot be another carbohydrate. A glycosidic bond is formed between the hemiacetal group of a saccharide (or a molecule derived from a saccharide) and the hydroxyl group of some compound such as alcohol. A substance containing a glycosidic bond is termed as a glycoside. A glycosidic bond is generally unstable and prone to hydrolysis. The different types of glycosidic linkages are classified as:
-O-glycosides (if the glycosidic bond is via oxygen); the foremost abundant form found in plants.
-C-glycosides (linkage via a carbon); this type of glycosides are linkage is resistant to hydrolysis.
-S-glycosides (linkage via sulfur; aglycone must have —SH group) are present in glucosinolates (thioglycosides).
-N-glycosides (linkage via nitrogen; aglycone must have —NH group)are present in nucleosides.

Note: A molecule that has nitrogen and has the chemical properties of a base. The nitrogen bonds are of four types. They are adenine, guanine, cytosine, and thymine. The adenine always bonds with guanine with the help of two hydrogen bonds. And the cytosine bonds with guanine with three hydrogen bonds. But in RNA the thymine is replaced by Uracil. So the nitrogenous bases in RNA are Adenine, Guanine, Cytosine, and Uracil.