Enzymes are molecular machines that carry out the chemical reactions that sustain all life, an ability that has captured the ...

all of these are chemical reactions, and they must take place quickly. How does your body speed up these important reactions? The answer is enzymes. Enzymes in our bodies are catalysts that speed up ...

The main evidence to support this contention has been the demonstration of the presence in both mitochondria and melanin granules of the enzymes succinic dehydrogenase and cytochrome oxidase.