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DNA is a double stranded macromolecule which is composed of nucleotides . The two DNA stands, joined by hydrogen bonds between the nucleotides and running antiparrallel to each other form a double helix s...

answer should include the use of helicase to 'unwind' DNA, breaking of hydrogen bonds, template and/or coding strand, free RNA nucleotides in the nucleus binding to exposed bases, attraction of base pairs...

Chemiosmosis is the method which cells use to create ATP for energy. It works a bit like a water wheel creating power. ATP synthase is like a water wheel in the inner membrane of mitochondria which create...

Enzymes are proteins that act as biological catalysts: they increase the rate of reactions without being used up themselves. A region on the enzyme, known as the active site, is very specific and compleme...

Platelets come into contact with an area of an artery wall which has become damaged, changing their shape from flattened disks to long thin projections. The platelets stick together, forming a temporary p...