AQA GCSE Biology - Paper 1 Exam Questions with Correct Answers

What does a nucleus do? - ANSWER-It contains genetic material and controls the activities of the cell What does cytoplasm do? - ANSWER-It's a gel-like substance where most of the chemical reactions happen. It contains enzymes that control these chemical reactions What does a cell membrane do? - ANSWER-It holds the cell together and controls what goes in and out What do mitochondria do? - ANSWER-These are where most of the reactions for aerobic respiration occur. Respiration transfers energy that the cell needs to work What do ribosomes do? - ANSWER-This is where protein synthesis takes place - where proteins are made in the cell What do cell walls do? - ANSWER-They are made of cellulose and they support and strengthen the cell What does a vacuole do? - ANSWER-It contains cell sap and helps maintain the shape of the cell What do chloroplasts do? - ANSWER-This is where photosynthesis occurs, which makes food for the plant. They contain chlorophyll - a green pigment - which absorbs light needed for photosynthesis What do bacterial cells contain? - ANSWER-Cytoplasm, cell membrane, cell wall, flagella, ribosomes, mitochondria, slime capsule, plasmids (small rings of DNA) and a single circular strand of DNA that floats freely in the cytoplasm What do bacterial cells NOT contain? - ANSWER-A nucleus What is the equation for magnification? - ANSWER-Image size divided by actual size What is differentiation? - ANSWER-The process by which a cell changes to become specialised for its job What are undifferentiated cells called? - ANSWER-Stem cells What are sperm cells specialised for and how are they specialised? - ANSWER-Reproduction - they transport the male DNA to the female DNA -It has a flagella and a streamlined head to help it swim towards the egg