核糖核酸

• 木(tree; wood)RADICAL
• 亥(pig (12th zodiac sign))PHONETIC

The kernel of a tree fruit (木) sounds like the character for pig (亥).

• 米(grain; seed)RADICAL
• 唐(large; empty (homophone of sugar))PHONO-SEMANTIC

Sugar is a sweet substance extracted from grain, with sound based on Tang.

• 酉(wine vessel; ferment)RADICAL
• 夋(slow manner; leisurely pace)PHONETIC

Fermenting alcohol produces sourness, which is exactly the character for sour.