Cell membranes protect and organize cells. All cells have an outer plasma membrane that regulates not only what enters the cell, but also how much of any given substance comes in. Unlike ...

A solar cell is made of two types of semiconductors, called p-type and n-type silicon. The p-type silicon is produced by adding atoms—such as boron or gallium—that have one less electron in their ...

Microscopes are needed to study cells in detail. Cell division - AQA Chromosomes carry genetic information in a molecule called DNA. A type of cell division called mitosis ensures that when a cell ...