Questions: A nucleotide is one of four bases. the sugar backbone of RNA a complex formed of a base, a sugar and the bond between them. a laundry detergent.

A nucleotide is one of four bases. the sugar backbone of RNA a complex formed of a base, a sugar and the bond between them. a laundry detergent.
Transcript text: A nucleotide is $\qquad$ one of four bases. the sugar backbone of RNA a complex formed of a base, a sugar and the bond between them. a laundry detergent.
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Solution

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The answer is the third one: a complex formed of a base, a sugar, and the bond between them.

Explanation for each option:

  1. One of four bases: This is incorrect. A nucleotide includes a base, but it is not just the base alone. The bases are adenine, thymine (or uracil in RNA), cytosine, and guanine.

  2. The sugar backbone of RNA: This is incorrect. The sugar backbone is part of the structure of RNA, but a nucleotide is more than just the sugar backbone; it includes a base and a phosphate group as well.

  3. A complex formed of a base, a sugar, and the bond between them: This is correct. A nucleotide consists of a nitrogenous base, a sugar (ribose in RNA or deoxyribose in DNA), and one or more phosphate groups.

  4. A laundry detergent: This is incorrect. A nucleotide is a biological molecule, not a detergent.

In summary, a nucleotide is a complex formed of a base, a sugar, and the bond between them.

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