Characteristics of enzymes: "XAre made up of proteins "XAre catalysts, as they speed up the rate of chemical reactions. "XRemain unchanged at the end of the reaction. "XAre needed in only small amounts. "XAre highly specific: one enzyme catalyses one type of reaction. "XWork best under certain optimum conditions of temperature and pH. Role of enzymes: Enzymes are organic catalysts. A catalysts is a general term for any substance that speeds up or brings about …showed first 75 words of 1019 total…

…showed last 75 words of 1019 total…below. Red blood cells - used to increase the amount of oxygen that can be carried to the body's tissues; given to people with anemia. Platelets - are essential for blood clotting. Platelets are given to patients with cancer; leukemia. Plasma - the liquid portion of blood contains blood-clotting factors. Plasma used to adjust the osmotic pressure of blood. Immunoglobins - are infection fighting parts of the blood plasma and used for people with AIDS.