Nucleic Acids and Strand Direction
Reading CAT from the opposite end gives TAC. Direction also matters when you read a DNA sequence, but DNA’s two ends are chemically different: one is called 5′ and the other 3′. Labeling those ends lets you identify how a strand is oriented and write its complementary strand correctly.
Carbon, Functional Groups, and pH
Two molecules can contain exactly the same atoms in exactly the same numbers and behave nothing alike. Ethanol and dimethyl ether are both \(\text{C}_2\text{H}_6\text{O}\) . One is a liquid that mixes with water in any proportion and that yeast produces by the ton; the other is a gas at ordinary roo
