Pathways that transform energy and matter Relationship of structure to function Information flow Interactions within biological systems
Surrounding the plasma membrane of most prokaryotic cells is a rigid cell wall, which protects the cell and helps maintain its shape.
If you think of the cell as a factory, then the nucleus is its control center. Here, the master plans are stored and orders are given.
Because genes that increase resistance to cholera offer a survival advantage where the disease is common, those genes have slowly spread through the Bangladeshi population over the past 30,000 years.
Evolution
Most of the living world depends on photosynthesis, which harnesses light from the sun to produce sugar molecules.