NEET BIOLOGY

CELL STRUCTURES AND FUNCTION

BIO MOLECULES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The building block of nucleic acids is nucleotides. Which is the CORRECT composition of a nucleotide?
A
sugar and phosphate
B
a base and a phosphate
C
a base and a sugar
D
a base, a sugar, and phosphate
Explanation: 

Detailed explanation-1: -A nucleotide is the basic building block of nucleic acids (RNA and DNA). A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base. The bases used in DNA are adenine (A), cytosine (C), guanine (G) and thymine (T).

Detailed explanation-2: -DNA is made up of four building blocks called nucleotides: adenine (A), thymine (T), guanine (G), and cytosine (C). The nucleotides attach to each other (A with T, and G with C) to form chemical bonds called base pairs, which connect the two DNA strands.

Detailed explanation-3: -A nucleotide is considered as the basic building block of the nucleic acid. Nucleic acids are composed of monomers called nucleotides that are made up of a nitrogen base, five carbon sugars and a phosphate group. In a nucleic acid, if the sugar is made up of a compound ribos, then it is ribonucleic acid.

Detailed explanation-4: -They are made up of a pentose sugar, a nitrogenous base and one or more terminal phosphate group(s). They are building blocks of DNA and RNA.

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