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Actin and myosin filaments. Myosin heads bind to actin filaments, and the hydrolysis of ATP causes them to change shape and pull the actin filaments along horizontally.

A section of DNA in a chromosome, that codes for the production of a specific protein. Genes have different alleles that provide variation.

A stem cell is an undifferentiated cell, that has the potential to become a specialised cell.

First, let's talk about the components of water. Water molecules are made of two hydrogen and one oxygen atom bonded together covalently, like many other molecules. However, water is extremely special bec...

Passive transport Diffusion = occurs in gases or aqueous solutions whereby particles are free to move and spread from a higher concentration to a lower concentration. An example is air freshener being spr...