2.5 Membrane Transport

2.5 Membrane Transport

Passive transport is diffusion of a substance across a membrane with no energy investment. Active transport uses energy to move solutes against their gradients. Bulk transport across the plasma membrane occurs by exocytosis and endocytosis.

2.1 Introduction to the Cell

2.1 Introduction to the Cell

The cell is an organism’s basic unit of structure and function. Many forms of life exist as single-celled organisms. Larger, more complex organisms, including plants and animals, are multicellular. In this chapter, we focus mainly on eukaryotic cells—cells with a nucleus.

Pagination