Question
In chemistry, the term aromatic describes any unusually stable ring system that adheres to the following four specific rules:
- ____>
Answer
In chemistry, the term aromatic describes any unusually stable ring system that adheres to the following four specific rules:
- The compound is cyclic.
- The compound is planar.
- The compound is conjugated (has alternating single and multiple bonds, or lone pairs, creating at least one unhybridized p-orbital for each atom in the ring).
- The compound has 4n + 2 (where n is any integer) π electrons. This is called Hückel’s rule.
Mnemonic: To remember the types and structures of these two classes of nitrogenous bases, remember to CUT the PYe (as C, U, and T are pyrimidines). You can also note that pie has one ring of crust, and pyrimidines have only one ring in their structure. You can also remember PURe As Gold (as A and G are purines); think of gold wedding rings. It takes two gold rings at a wedding, just like purines have two rings in their structure.
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There are two chemically distinct forms of nucleic acids within eukaryotic cells.____.
The bulk of DNA is found in ____.
Nucleosides are composed of a ____.
____ are composed of a five-carbon sugar bonded to a nitrogenous base.
Nucleosides are formed by covalently linking the ____.
Nucleotides are formed when one or more ____.