alleryStart learning →Adenosine is a nucleoside. Which two parts make it up?
AAdenine and a phosphate group
BAdenine and the sugar ribose
CRibose and a phosphate group
DGuanine and the sugar ribose
Answer & Solution
Correct answer: B. Adenine and the sugar ribose
1. Adenosine is a nucleoside consisting of the nitrogenous base adenine and a five-carbon sugar, ribose.
2. The three phosphate groups are attached to this adenosine to make ATP, so they are not part of adenosine itself.
3. Adenine is the base named here, so substituting guanine changes the molecule.
4. Ribose plus a phosphate would leave out the nitrogenous base altogether.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 6 "Metabolism", section 6.4 ATP: Adenosine Triphosphate_
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