AQA GCSE Trilogy B1 Cell Biology Exam Questions and Answers

AQA GCSE Trilogy B1 Cell Biology Exam Questions and Answers Contains genetic material that controls the cell - Answer️️ -Nucleus Gel-like substance in which most of the chemical reactions occur. Contains enzymes which control reactions - Answer️️ -Cytoplasm partially permeable membrane to control what enters and leaves the cell. - Answer️️ - Cell membrane site of respiration - Answer️️ -Mitochondria site of protein production - Answer️️ -Ribosomes Made of cellulose, supports the cell - Answer️️ -Cell wall contains cell sap - Answer️️ -Vacuole Site of photosynthesis, contains chlorophyll - Answer️️ -Chloroplasts Nucleus, cell wall, cell membrane, nucleus, cytoplasm - Answer️️ -Yeast cell Cytoplasm, cell wall, cell membrane, loose genetic material - Answer️️ -Bacterial cells Cells e.g. bacteria that do not have a nucleus. DNA is free in the cytoplasm - Answer️️ -Prokaryotic Cells A small ring of DNA found in bacterial cells. - Answer️️ -Plasmid Image=Actual size x magnification - Answer️️ -IAM Calculation I=AxM so 100x50 =5000 micrometers 5000/1000 =5mm - Answer️️ -A specimen is 50 micrometers wide. Calculate the width of the specimen under a magnification of x100. Give your answer in mm. Electron microscopes have a higher magnification and a higher resolution that a light microscope. Electron microscopes let us see much smaller things in more detail, like the internal structure of a mitochondria or chloroplast. - Answer️️ -What is the difference between the light microscope and an electron microscope? The net movement of particles from an area of high concentration to an area of low concentration - Answer️️ -Diffusion Increases the rate of diffusion - Answer️️ -A higher concentration gradient Glucose, oxygen, amino acids, water - Answer️️ -Molecules that can diffuse through the cell membrane The movement of water across a partially permeable membrane from a region of high water concentration to a region of low water concentration. - Answer️️ -Osmosis Water will move out of the piece of potato by osmosis as there is a higher concentration of water inside the potato, so its mass will decrease. - Answer️️ -What will happen to the mass of a piece of potato added to a concentrated salt solution and why? The movement of substances against a concentration gradient, i.e. from a lower to higher concentration gradient. This process requires energy. - Answer️️ -Active transport Coiled up lengths of DNA molecules found in the nucleus. Each chromosome carries a large number of genes. Human body cells have 23 pairs. - Answer️️ -Chromosom