Cells make up all life on Earth. Cells are the smallest unit of life. All cells have specific structures, called components. Models in science are used to help us understand complicated ideas in a ...

Although all of the cells that make up a multicellular organism contain identical genetic information, functionally different cells within the organism use different sets of catalysts to express ...

and plant cells harness solar energy and use it to make the complex organic food molecules that other cells rely on for the energy required to sustain growth, metabolism, and reproduction (Figure 1).