GCSEs Revision 9-1 🦋 @revisegcses

PHOTOSYNTHESIS: carbon dioxide + water → glucose + oxygen RESPIRATION: glucose + oxygen → carbon dioxide + water #GCSEs2018

HELPFUL LINKS FOR SCIENCE: - @Primrose_Kitten (has whole of B1 in an hour etc. very useful especially for cramming!) youtube.com/channel/UCBgvm… - @UKScienceguy FREE SCIENCE LESSONS youtube.com/channel/UCqbOe… - PHYSICS EQUATIONS SONG ( SO CATCHY!!! ) youtu.be/G3K6ZdtFZlg #GCSEs2018

if you have questions dm me and i’ll try my hardest to help and answer! focusing on biology 1 tonight / tomorrow morn but also happy to help with any subjects 💛 #GCSEs2018

ENZYMES ARE NEVER KILLED. they are SLOW, getting faster as temp increases up to 37°C (body temp) which is OPTIMUM temperature. they then slow down until they DENATURE at around 45°C! #GCSEs2018

AQA B1 PRATICALS for TOMORROW! playlist which explains all in detail: youtube.com/playlist?list=… 1. microscopes 2. culturing micro organisms 3. effects of osmosis on plant (potato) 4. food tests 5. effect of pH on amylase 6. photosynthesis EASY MARKS IF YOU LEARN! #GCSEs2018

CHOLESTEROL FACTS: - found in blood, made in liver - too much = risk of heart disease / disease in arteries. cholesterol is transported in blood attached to proteins. low density cholesterol = build up of fat on artery walls whereas low density stops this. #GCSEs2018

DIFFERENTIATION : when cells become SPECIALISED ( eg. muscle cells in animals or root hair cells in plant cells! ) undifferentiated cells are STEM CELLS - these can then be differentiated to form particular cells. #GCSEs2018

MEIOSIS: how GAMETES are formed IMPORTANT: 1. copies of genetic material made 2. divides twice to form 4 gametes METHOD: in parent cell: - chromosomes make copies of themselves - similar chromosomes pair up - sections of DNA swap - pairs divide - chromosomes divide #GCSEs2018

PLANT CELLS: same as animals cells AND... chloroplasts - PHOTOSYNTHESIS ( contains chlorophyll ) cell wall - made of CELLulose, strengthens cell!! vacuole - contains cell sap and helps to keep cell shape!!! #GCSEs2018

ANIMAL CELLS: nucleus - contains DNA + chromosomes cytoplasm - site of chemical reactions ribosomes - protein synthesis ( where proteins are made! ) mitrochondria - site of respiration cell membrane - controls what enters and leaves the cell + holds cell together! #GCSEs2018

revision hack: watch @Primrose_Kitten’s B1 in an hour on speed 1.25 or 1.5! this takes up less time but means you still get get all the detail & maybe even have time to rewatch in time for biology 1 tomorrow! #GCSEs2018

ACTIVE TRANSPORT: the net movement of particles from an area of low concentration to and area of high concentration AGAINST / UP the concentration gradient across a cell membrane. this REQUIRES ENERGY #GCSEs2018

OSMOSIS: the net movement of water molecules from an area of high concentration to an area of low concentration DOWN / ALONG the concentration gradient through a PARTIALLY PERMEABLE membrane! #GCSEs2018

DIFFUSION: the net movement of gas particles + particles in dissolved solutions through a cell membrane from an area of high concentration to an area of low concentration DOWN / ALONG the concentration gradient! #GCSEs2018

FOOD TESTS: 1. take sample of food and GRIND with distilled water using a MORTAR and PESTLE until it becomes a paste 2. put paste in beaker, add distilled water. stir so chemicals dissolve in water. 3. FILTER solution to remove suspended food particles #GCSEs2018

V = Vena Carva ( deoxygenated blood from body ) A = Right Atrium V = Right Ventricle A = Pulmonary Artery ( to lungs ) V = Pulmonary Vein ( from lungs ) A = Left Atrium V = Left Ventricle A = Aorta ( oxygenated blood to body ) #GCSEs2018