There are thousands of reactions taking place inside our body every second and every reaction is only possible due to presence of enzymes. You will be able to find the required enzyme (from thousands of enzymes in the database) for a desired reaction in not more than three steps. This will also help in understanding the relationship between reaction and the enzyme. This process just requires knowledge of nature of bio-molecules. You can also explore enzymes in ENZYME DATABASE(inbuilt) for FREE.