To lower the activation energy of metabolic reactions/ to act as catalysts
Antibiotics are ineffective against viruses because viruses do not have cells. Viruses are infectious agents that live within the cells of other living things. Antibiotics work by breaking down the cell walls of bacteria or interfering with the bacteria's ability to repair its cell's DNA, according to How Stuff Works
Answer:
Leave is an important structure of plant body where food production occurs in the process of photosynthesis. In the leaves, small tiny pores called stomata are present on lower side of the leaf. These pores are responsible for the exchange of gases such as carbondioxide and oxygen. These stomata opens and carbondioxide is absorbed from the atmosphere and water from the soil. Both reactants combine in the presence of sunlight producing oxygen and glucose. Oxygen is released through stomata and glucose is stored in different parts of plant.