Final answer:
A molecule with a nitrogenous base bonded to the 1' carbon of a ribose or deoxyribose is a nucleoside, which differs from a nucleotide that also includes a phosphate group. a) Nucleoside
Step-by-step explanation:
A molecule that consists of a nitrogenous base bonded to the 1′ carbon of a ribose or deoxyribose is known as a nucleoside. This compound is a fundamental component of nucleic acids, being part of the structure that underlies the genetic code in the form of DNA and RNA.
While a nucleotide also contains a phosphate group in addition to the sugar and base, a nucleoside comprises only the nitrogenous base and the five-carbon sugar (either ribose or deoxyribose). In DNA, the sugar is deoxyribose, which lacks an oxygen atom at the 2' position, whereas in RNA, the sugar is ribose which contains that oxygen atom.