A cell membrane forms a boundary between the cytoplasm of the cell and the ouside it is not a complete barrier some chemicals pass into and out of the cell it is permeable to them it controls which substances pass in either direction we say that it is selectively permeable a cytoplasm is the living material it is a complex material made of many different structures it helps . Study flashcards on edexcel igcse biology at cramcom quickly memorize the terms phrases and much more cramcom makes it easy to get the grade you want home up down arrow keys flip the card between the front and back down key up key h key show hint 3rd side h key a key read text to speech a key. Edexcel igcse biology revision keywords and definitions for triple award igcse science only biology study play active transport when a substance moves against up a concentration gradient from a region where they are of lower concentration to a region where they are of higher concentration. Think kit revision study pack stationery supplies and planning tools for gcse a level university students including revision cards wall planner exam compliant pencil case post it notes and more. Igcse biology revision notes made for the edexcel international exam board this covers all the topics and modules for all specifications including 4bi0 and 4bi1 below we cover all the topics mentioned in the latest syllabus
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