(1) According to the "Structure Model Diagram of Yeast Cells": ① Cell membrane, ② Nucleus, ③ Cytoplasm, ④ Vacuole.
(2) Yeast is a single-cell fungus. In addition to having a cell wall, cell membrane, and cytoplasm, yeast has a formed nucleus and vacuole. The cell structure of yeast is similar to that of plant cells, but without Chloroplasts cannot carry out photosynthesis and cannot produce organic matter. Their lifestyle is heterotrophic and must absorb readily available organic matter to maintain life.
So the answer is:
(1) Cell membrane; Nucleus; Cytoplasm; Vacuole
(2) Single; Chloroplast; Photosynthesis; Organic matter