When you’re one of the 70 million Americans whose digestion is off, it’s understandable to want to do what you can to turn things around quickly. Social media is packed with posts from people who ...

DNA repair enzymes are enzymes that recognize and correct physical damage in DNA, caused by exposure to radiation, UV light or reactive oxygen species. The correction of DNA damage alleviates loss of ...

Enzyme mechanisms are the chemical transformations, and the steps within them, generated by enzymatic action on substrates. The mechanism of enzyme catalysis is similar in principle to other types of ...

Here you can find CCEA past papers for GCSE Biology (Single Science). Use the links below to download question papers and mark schemes (which contain the answers). If you’re unsure whether you need ...