THE MOLECULAR BASIS OF INHERITANCE
STRUCTURE OF NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Nitrogenous base, sugar and phosphate
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Nitrogenous base and phosphate only
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Nitrogenous base and sugar only
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Sugar and phosphate only
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Detailed explanation-1: -A nucleoside consists simply of a nucleobase (also termed a nitrogenous base) and a five-carbon sugar (ribose or 2’-deoxyribose) whereas a nucleotide is composed of a nucleobase, a five-carbon sugar, and one or more phosphate groups.
Detailed explanation-2: -A nucleoside has two components-a pentose sugar (deoxyribose in DNA and ribose in RNA) and a nitrogenous base (adenine/guanine/thymine/cytosine and adenine/guanine/cytosine/uracil in DNA and RNA respectively).
Detailed explanation-3: -Nucleosides consist of a purine or a pyrimidine base and a ribose or a deoxyribose sugar connected via a -glycosidic linkage. These compounds are associated with structures of RNA (ribose sugars) and DNA (deoxyribose sugars).
Detailed explanation-4: -Nucleotide 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-5: -Nucleosides have a nitrogenous base and a five-carbon carbohydrate group, usually a ribose molecule (see Chapter 2). Nucleotides are simply a nucleoside with one or more phosphate groups attached (Figure 4-1). The resulting molecule is found in ribonucleic acid or RNA.