Question

__________is the correct pairing of nitrogenous bases.
(a)Glycerol and Uracil
(b)Guanine and Uracil
(c)Nucleic acid and bases
(d)Cytosine and Adenine
(e)Adenine and Thymine

Answer 1

Hint: The correct pair includes a purine nitrogen base derived from nucleotide inosine monophosphate and pyrimidine nitrogen bases which are absent in RNA derived from deoxy-uridine monophosphate are linked together by double hydrogen bonds.

Complete answer:
In ds DNA thymine bond to adenine by two hydrogen bonds and guanine bond to cytosine by three hydrogen bonds. These nitrogenous sequences are present on two complementary antiparallel strands wound around each other in a rightward direction and stabilized by hydrogen bonding between bases in adjacent strands.

Additional Information:
-There are two types of nitrogenous bases: Purine- adenine and guanine; and Pyrimidine- cytosine, thymine, and uracil.
-Nitrogenous base bond to ribose in RNA and nitrogenous base bond to deoxyribose in DNA called nucleoside. They are linked together by 1’ are linked to nitrogen 9 of the purine or nitrogen 1 of the pyrimidine bases by β- glycosidic bonds.
-A nucleotide is a monomeric unit of RNA and DNA where a phosphate group and a nitrogenous base are both bonded to ribose or deoxyribose.
-Phosphodiester is a bond where two different alcohols form ester linkages with phosphate ions.

So, the correct answer is, ‘Adenine and Thymine.’

Note: -DNA is present in the nuclei but in a small amount also present in the mitochondria.
-RNA is present in the cell cytoplasm 90% and 10% present in the nucleolus.
-Adenine= 1-adenine 6-aminopurine
 Guanine=2-guanine 2-amino 6-oxypurine
 Cytosine= cytosine 2-oxy-4-aminopyrimidine
 Uracil= n2,4-dioxyprimidine
 Thymine= 2,4-deoxy 5-methyl