AQA GCSE BIOLOGY ;PAPER 1 EXAM WITH VERIFIED QUESTIONS

AQA GCSE BIOLOGY ;PAPER 1 EXAM WITH VERIFIED QUESTIONS 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 -There are lots of mitochondria in the cell to provide the energy needed -It carries enzymes in its head to help digest through the egg cell membranes What are nerve cells specialised for and how are they specialised? - ANSWER Rapid signalling - they carry electrical signals from one part of the body to another -They are long to cover more distance -They have branched connections at their ends to connect to other nerve cells and form a network throughout the body What are muscle cells specialised for and how are they specialised? - ANSWER Contraction - they need to contract quickly -They are long so they have space to contract -They contain lots of mitochondria to generate the energy needed for contraction 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