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DNA

Deoxyribose i...

Question

Deoxyribose in DNA nucleotides belongs to:

A

electrolytes

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B

lipids

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C

proteins

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D

carbohydrates

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E

nucleic acids

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Solution

The correct option is E nucleic acids
Deoxyribose in DNA nucleotides belongs to carbohydrates. It is a pentose sugar.

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Q. A ribose (but not deoxyribose) nucleotide is

Q. Polynucleotides are called nucleic acids. Each nucleotide is made up of three parts, i.e, a pentose sugar, a heterocyclic nitrogenous base and phosphoric acid. Depending upon the nature of sugar whether, ribose or deoxyribose, nucleic acids are called RNA and DNA respectively. In all, there are five nitrogenous bases, two of which are purines while the remaining three are pyrimidines. Out of these five bases, each type of nucleic acid has four of them.

In nucleic acids, the nucleotides are linked to one another through:

Q. Match List I (structure) with list II (explanation/definition) and select the correct answer.

List-I	List-II
a. Nucleoside	$1$ . Deeply stained body containing rRNA
b. Nucleotide	$2$ . Portion of a DNA or RNA composed of one deoxyribose(in DNA) or ribose(in RNA) plus a purine or a pyramidine
c. Nucleolus	$3$ . Short disk-shaped cylinders composed of nucleoproteins and spaced at roughly $100$ A intervals on chromosomes
d. Nucleosome	$4$ . Portion of DNA or RNA composed of a purine or pyramidine base, a deoxyribose (in DNA) or a ribose (in RNA) and phosphoric acid

Q. Why do DNA have beta deoxyribose and not alpha deoxyribose in its structure?

Q. Polynucleotides are called nucleic acids. Each nucleotide is made up of three parts, i.e, a pentose sugar, a heterocyclic nitrogenous base and phosphoric acid. Depending upon the nature of sugar whether, ribose or deoxyribose, nucleic acids are called RNA and DNA respectively. In all, there are five nitrogenous bases, two of which are purines while the remaining three are pyrimidines. Out of these five bases, each type of nucleic acid has four of them.

Which base is only found in the nucleotide of RNA?

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