The compound formed by combination of a base and a pentose sugar is called:
Correct answer: A. Nucleoside
- A. Nucleoside
- B. Nucleotide
- C. Nucleic acid
- D. Nuclein
Explanation
The correct answer is nucleoside. A nucleoside is formed when a nitrogenous base combines with a pentose sugar. It is a crucial component in the structure of nucleic acids, serving as a precursor for nucleotides. Nucleotides, on the other hand, also include phosphate groups in addition to the base and sugar. Therefore, the term 'nucleotide' is incorrect for this question because it requires the presence of a phosphate group. 'Nucleic acid' refers to the entire macromolecule composed of nucleotide chains, and 'nuclein' is an outdated term that is not applicable here.
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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