Aqa Gcse Combined Science Trilogy : Biology Paper 1 Already Passed

How does the concentration of carbon dioxide affect the rate of photosynthesis? Describe the graph {Ans: As the concentration of carbon dioxide increase, so does the rate of photosynthesis since it is one of the raw materials needed for the reaction to take place, however, the rate of photosynthesis will no longer increase once it has reached a certain point because another factor has become limiting}Who discovered antibiotics? {Ans: Alexander Fleming}How can HIV be dangerous? {Ans: If the body's immune is badly damaged from HIVm it can't cope with other infections or cancers. At this stage, the virus is known as late stage HIV infection, or AIDS}What gas diffuses out of the blood? {Ans: Carbon dioxide}How are sperm cells specialised? {Ans: For reproduction: they have a long tail and a streamlined head to help it swim to the egg, there are lots of mitochondria in the cell to provide the energy needed and it also carries enzymes in its head to digest through the egg cell membrane}What are communicable diseases caused by? {Ans: bacteria, viruses, parasites, fungi}What is the function of the vein? {Ans: carries blood to the heart}What do bacterial cells have