A cell's daily operations are accomplished through the biochemical reactions that take place within the cell. Reactions are turned on and off or sped up and slowed down according to the cell's ...

Cell signalling is the mechanism by which stimuli are transmitted via a signalling cascade to effector molecules that orchestrate the appropriate response. Types of cell signalling pathways ...

Interphase The cell spends most of its life in this phase. The DNA in chromosomes copies itself ready for mitosis. Prophase The DNA in chromosomes and their copies condenses to become more visible.

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 ...