B2.1 Revision 0.0 / 5 ? BiologyCells, tissues and organsGCSEOCR Created by: milypaul16Created on: 13-11-16 20:16 What is Diffusion? The movement of molecules from an area of high concentration to an area of low concentration, until evenly spread out. 1 of 23 Give an Example of Diffusion in the Body When cells respire, materials like glucose,oxygen & carbon dioxide enter & leave the cell by Diffusion. 2 of 23 What do all living things rely on to live? Respiration 3 of 23 What is the word equation for Photosythesis? Carbon Dioxide + Water = Oxygen + Glucose 4 of 23 What is Osmosis? Osmosis is the movement of water from a high water concentration to a low water concentration through a partially permeable membrane. 5 of 23 How does Osmosis help roots? By aiding the root hairs to take water from the soil. 6 of 23 What is a Turgid Cell? When water enters a plant cell & pushes on the cell wall- cell swells 7 of 23 What is a Flaccid Cell? A plant cell that is limp through a reduction of pressure inside the cell. 8 of 23 What does 'partially permeable' mean? a membrane that allows some substances to pass through & others cannot. 9 of 23 What does 'Plasmolysed' mean? When water leaves a plant cell, the cell contents shrink & the cell membrane pulls away from the cell wall. 10 of 23 What is Active Transport? The movement of particles from a low concentration gradient. 11 of 23 What does Active Transport use from Respiriation? Energy-ATP! 12 of 23 What is a concentration gradient? When particles(solute) move to an area that has low/small amount of particles-from a high concentration of particles. 13 of 23 How do minerals get to Root Hair cells? Through Active Transport. 14 of 23 Does Active Transport need a permeable membrane?Why? No- it needs a semi-permeable membrane. 15 of 23 What is Cell Division? The division of a cell into two daughter cells with the same genetic material 16 of 23 What is Mitosis? A type of cell division-It produces two new cells that are identical to each other, and to the parent cell. 17 of 23 What type of reproduction is Mitosis? Why? Asexual-because the daughter cells are identical to the parent cell. 18 of 23 When does Mitosis occur? When there is more cells needed. 19 of 23 What is the 1st step in Mitosis? Dna in each chromosome replicates- it unzips to form single strands. Then, new double strands form by complimentary base pairing. 20 of 23 What pulls the chromosomes apart to the opposite ends of the cell, during Mitosis? Spindle Fibres 21 of 23 Where do spindle fibres form from? Centrioles 22 of 23 What occurs after Mitosis? Cytokinesis-cell membrane moves inward to create two daughter cells-each with its own nucleas with identical chromosomes 23 of 23
Comments
No comments have yet been made