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Nucleotides and Nucleosides

Compounds tha...

Question

Compounds that contain a nitrogenous base, a sugar, and a phosphate group are called (i)_. The nitrogenous bases that bind to the sugar are of two types;(ii)and (iii), and they are linked to the sugar through (iv) bond.

A

Nucleotides Purines Pyrimidines Hydrogen

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B

Nucleosides Purines PAH Peptide

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C

Nucleases Cytosine Pyrimidines Phosphodiester

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D

Nucleotides Purines Pyrimidines Disulfide

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Solution

The correct option is A
Nucleotides Purines Pyrimidines Hydrogen

The basic unit of a nucleic acid is a nucleotide. It is formed by a nitrogenous base, a sugar and a phosphate group. The nitrogenous bases that bind to the sugar are of two types; purines consisting of adenine and guanine and pyrimidines consisting of cytosine, thymine in DNA and uracil in RNA. The nitrogenous base links to the sugar through an N-glycosidic bond.

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Q. Compounds that contain a nitrogenous base, a sugar, and a phosphate group are called (i)_______. The nitrogenous bases that bind to the sugar are of two types;(ii)______and (iii)______, and they are linked to the sugar through (iv)______ bond.

Q. Read (i) to (v) and find the correct option.
(i) Nitrogen base is linked to pentose sugar through

N -

glycosidic linkage
(ii) Phosphate group is linked to

5^{'} - O H

of a nucleoside through phosphoester linkage
(iii) Two nucleosides are linked through

3^{'} - 5^{'} N -

glycosidic linkage
(iv) Negatively charged

D N A

is wrapped around positively charged histone octamer to form nucleosome
(v) Chromatin that is more densely packed and stains dark is called euchromatin

Q. Match the column I with column II and mark the appropriate choice.

Column I	Column II
(A) Nucleoside	(i) Sugar + base + phosphate group
(B) Nucleotide	(ii) Cytosine + uracil
(C) DNA	(iii) Sugar + base
(D) RNA	(iv) Cytosine + thymine

Q. A nucleotide consists of a sugar molecule, nitrogenous base and a phosphate group.

A nucleotide consists of a sugar molecule, a nitrogenous base, and a phosphate group.

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