CHEM 210 Module 6 Exam Newest
1. What is the difference between a nucleoside and nucleotide?: A nucleoside is formed
from the covalent bonding of a base (purine or pyrimidine) to either ribose (RNA) or 2-
deoxyribose (DNA). Nucleotides are built from a nitrogen-containing organic base, a
monosaccharide, and phosphate.
2. What characteristic makes purines and pyrimidine heterocyclic?: Each has a ring
with nitrogen in the ring instead of all carbon atoms in the ring.
3. Is this molecule ribose or 2-deoxyribose? Briefly explain what structural
information was used to determine this.: Ribose. This molecule contains an -OH on carbon
2. 2-deoxyribose has an -H atom on the second carbon.
4. Is the following a pyrimidine or purine? Provide the name and one-letter
