DNA methylation is the covalent addition of methyl groups to DNA bases, typically the cytosine of CpG dinucleotides. It is catalyzed by methyltransferase enzymes using a S-adenosyl methionine ...

blood a pump (the heart) to push the blood around the body a system of tubes to contain the blood (arteries, veins and capillaries) The blood is the transport medium – it carries substances to ...

Aseptic techniques ensure the microorganisms being investigated do not escape or become contaminated with an unwanted microorganism.

That’s it, former, current and future year 11s… the mock season has begun! Having just sat my first two GCSE mock exams, I can finally appreciate why teachers begin to express unusual ...