BCH101intermediate
Arrange these structural levels in order from the smallest unit to a nucleotide polymer: base, nucleoside, nucleotide, nucleic-acid strand.
Answer
Base, Nucleoside, Nucleotide, Nucleic-acid strand
Explanation
### The order
1. **Base**: the nitrogenous component is considered first.
2. **Nucleoside**: a base attaches to a pentose sugar.
3. **Nucleotide**: phosphate is added to the nucleoside.
4. **Nucleic-acid strand**: many nucleotides join through phosphodiester bonds.
### Remember
Build from base, to base-plus-sugar, to nucleotide, to polymer.
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