Carbohydrates are the primary energy source that plays an essential role in biological systems especially in the respiratory system Carbohydrates are produced by the process of photosynthesis in green leafy plants Carbohydrates can be energy like glucose in human and animal tissue cells Carrying carbohydrates by yeast or other microbes can produce CO2 alcohol organic acids and other organic substances Carbohydrates are the primary energy source that plays an essential role in biological systems especially in the respiratory system Carbohydrates are produced by the process of photosynthesis in green leafy plants Carbohydrates can be energy like glucose in human and animal tissue cells Carrying carbohydrates by yeast or other microbes can ...produce CO2 alcohol organic acids and other organic substances