Ocr Gcse (91) Biology A (Gateway Biology) J247/03 Paper 3 Higher Tier June 2023 Question Paper

What is differentiation? {Ans: Differentiation is the process by which a cell changes to become specialised for its job.}Drugs: Explain how stimulants affect nerve impulses {Ans: Increase the amount of chemicals across the synapse, leading to more impulses Increased alertness and faster reactions E.G Ecstasy, Cocaine, Caffeine, Nicotine}What respires? {Ans: All living things, including plants}Why is the use of embryonic stem cells seen as unethical by some people? {Ans: Embryos are destroyed, when they could have become a person. Scientific research using embryonic stem cells is regulated by the government for this reason}What are FSH's functions in the menstrual cycle? {Ans: >It causes an egg to mature in one of the ovaries. >To stimulate the ovaries to produce oestrogen.}Explain the service DOMs from forests provides the city {Ans: Soil is rich in DOM from rotting leaves, and holds water like a sponge. Water gradually drains into rivers, supplying the city so that there are reserves for the dry period}What is type two diabetes? {Ans: When the person becomes resistant to insulin which can also cause blood sugar levels to rise to a dangerous level. *pic*}How does the patch prevent pregnancy and how effective