Q.How does a Nucleotide differ from a Nucleoside?

Nucleic acids (DNA and RNA) are polymers of nucleotide monomers, each nucleotide itself made of a nitrogenous base, a five-carbon (pentose) sugar, and a phosphate group.

Each nucleotide has three components:

1. A nitrogenous base — a purine (adenine, guanine) or a pyrimidine (cytosine, thymine in DNA / uracil in RNA).
2. A pentose sugar — deoxyribose in DNA, ribose in RNA.
3. A phosphate group. …

A nucleotide has three components: sugar, phosphate and nitrogenous base — so the answer is (C).

A nucleotide, the monomer of DNA and RNA, is made of three units:

1. A pentose sugar (deoxyribose in DNA, ribose in RNA).
2. A phosphate group.
3. A nitrogenous base (adenine, guanine, cytosine, thymine or uracil). …

A nucleotide = nitrogenous base + sugar + phosphate. The nucleotide of guanine is guanylic acid (GMP), formed from the nucleoside guanosine plus a phosphate group.

A nucleic acid is built from nucleotides, each of which has three components: a nitrogenous base, a pentose sugar, and a phosphate group.

• Base + sugar alone (no phosphate) = nucleoside. For guanine this is guanosine (base + ribose/deoxyribose). …

Nitrogenous bases split into purines (double ring) and pyrimidines (single ring); adenine is the odd one out here as a purine.

Nitrogenous bases in nucleic acids are of two chemical classes:

• Purines: double-ring structure -- Adenine (A) and Guanine (G)
• Pyrimidines: single-ring structure -- Cytosine (C), Thymine (T, found only in DNA), and Uracil (U, found only in RNA) …

Ribose and deoxyribose both contain 5 carbon atoms, making them pentose sugars.

Monosaccharides are classified by the number of carbon atoms they contain: trioses (3C), tetroses (4C), pentoses (5C), and hexoses (6C, e.g., glucose, fructose). Ribose (the sugar backbone of RNA) has the formula C5H10O5, and deoxyribose (the sugar backbone of DNA) is ribose with one oxygen removed at the 2' carbon (C5H10O4) -- both retain 5 carbon atoms in th …

ATP stores and releases energy for cellular work → (d).

• ATP (adenosine triphosphate) carries energy in its high-energy phosphate bonds; hydrolysis of ATP → ADP + Pi releases energy for muscle contraction, active transport, biosynthesis, etc. …

Nucleic acids (DNA, RNA) are polymers of repeating nucleotide units.

Nucleic acids — DNA and RNA — are polymers built from repeating monomeric units called nucleotides. Each nucleotide is itself made up of three components: a nitrogenous base (a purine like adenine/guanine, or a pyrimidine like cytosine/thymine/uracil), a pentose sugar (deoxyribose in DNA, ribo …

Nucleic acids (DNA and RNA) contain nitrogenous bases belonging to two chemical classes: purines (double-ringed) and pyrimidines (single-ringed).

The nitrogenous bases found in nucleic acids are:

• Purines — Adenine (A) and Guanine (G), found in both DNA and RNA.
• Pyrimidines — Cytosine (C), found in both DNA and RNA; Thymine (T), found only in DNA; and Uracil (U), found only in RNA (replacing thymine). …

The base unique to DNA (absent from RNA) is thymine — but thymine is a pyrimidine base, not a purine; the two purine bases (adenine and guanine) are common to both DNA and RNA.

Nucleic acids contain two classes of nitrogenous bases: purines (double-ringed) — adenine and guanine — and pyrimidines (single-ringed) — cytosine, thymine, and uracil. Adenine and guanine (the purines) are present in both DNA and RNA in equal fashion, so no purine base is exclusive to DNA. Among the pyrimidines, cytosine is common to both, while thymine is found only in DNA and uracil is found only in RNA (RNA uses uracil in place of thymine). Honestly noting this: the question as printed asks for a 'purine base found only in …