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DNA is made of two strands coiled to form a double helix each strand containing chemical called bases.-There are four different types of bases are A-T ,G-C Cells such as liver or muscle cells have large numbers of mitochondria. This is because the liver carry out many function and muscle cells need to contract .

All proteins are made of long chains of amino acid joined together.

Enzymes speeds up reaction reaction in the body and so are called biological catalysts. Fits into the active site of the enzyme like a key fitting into a lock. Enzymes are described as working according to the lock and key mechanism. Enzymes all work best at a particle temperature and ph.

Mutation may occur spontaneously but can be made to occur more often by radiation or chemicals.when they occur , mutation. may lead to the production of different proteins are often harmful but may have no effect.

Glucose+oxygen----------- carbon dioxide+ water

During exercise , despite an increase