Aqa Gcse Biology - Paper 1 |259 Questions| With Correct Answers.

Calculation - Rate of Reaction {Ans: Rate = 1000/time}What are nitrates needed for? {Ans: To make proteins, which are needed for growth}What are artificial hearts used for? {Ans: -If heart donor organs aren't available or suitable, they are used instead -They are mechanical devices that pump blood around the body if someone's heart has failed -They're usually temporary to allow someone's heart to rest and heal -They're made from metal or plastic, therefore, they're less likely to be rejected by the body's immune system -Surgery to fit one can cause bleeding and infection -They don't work as well as healthy natural ones -Blood doesn't flow through them smoothly which can cause blood clots which leads to strokes}What's the problem with a weak immune system? {Ans: You have an increased chance of suffering from communicable diseases (e.g. the flu) because the body is less likely to be able to defend itself against the pathogen that causes the disease}What is health? {Ans: The state of physical and mental wellbeing}What do chloroplasts do? {Ans: This is where photosynthesis occurs, which makes food for the plant. They contain chlorophyll - a green pigment - which absorbs light needed