[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-208096-en":3,"doc-seo-208096-105":29,"detail-sidebar-cat-0-en-105":88},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":4,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":20,"language":21,"language_code":22,"site_id":23,"html_lang":22,"table_of_contents":24,"faqs":25,"seo_title":26,"seo_description":14,"update_tm":27,"read_time":28},208096,549768072016,"WPS_1786070896","https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d",4,"Exam","Collins GCSE OCR Biology All-in-One - Cell Level Systems - Exam Revision","Cell Level Systems focuses on how microscope techniques reveal cells and their subcellular structures, linking methods to what can be observed. It explains light microscopy, staining, and the role of mordants, then contrasts this with electron microscopy for detailed structures like ribosomes and membranes. The guide also compares key cell structures in animal and plant cells, including shared components and plant-only features, and distinguishes prokaryotes from eukaryotes. Conversion relationships between metres, micrometres, and nanometres support accurate scale understanding.","Cell Level Systems  \nCell Structures  \nYou must be able to:  \n• Describe how light microscopes and staining can be used to view cells  \n• Explain how the main subcellular structures are related to their functions  \n• Explain how electron microscopy has increased understanding of subcellular structures.  \n• Light microscopes are useful for viewing whole cells or large subcellular structures.  \n• The specimen is placed on a glass slide, covered with a cover slip and placed on the stage of the microscope.  \n• The eyepiece and objective lenses magnify the object.  \n• A lamp provides illumination.  \n• Magnification is calculated by multiplying the magnification of the eyepiece lens by the magnification of the objective lens.  \n• Typical magnification is between 40 and 2000 times larger with aresolution of about 0.2 micrometres (µm) .  \n• Stains can be used to colour whole cells and structures within cells, e.g. the nucleus, to make them easier to see.  \n• Sometimes a mordant is used, which fixes the stain to the structures.  \n• Electron microscopes are useful for viewing subcellular structures, such as ribosomes, mitochondrial membranes and nuclear membranes, in detail.  \n• They use a beam of electrons instead of a lamp.  \n• The specimen is placed inside a vacuum chamber.  \n• Electromagnets are used instead of lenses.  \n• The image is viewed on a TV screen.  \n• Typical magnification is 1 to 2 million times larger with a resolution of 2 nanometres (nm) .  \nStained Bacteria Viewed using a Light Microscope  \nBacteria Viewed using an Electron Microscope  \n1 metre (m) = 1000 000 micrometres (µm) 1µm = 10–6 m  \n1 metre (m) = 1000 000 000 nanometres (nm) 1nm = 10–9 m  \nTo convert m to mm, multiply by 1000.  \nTo convert mm to µm, multiply by 1000.  \nTo convert µm to nm, multiply by 1000.  \nTypical Animal Cell  \n10–100µm  \nVirus  \n80nm  \nChloroplast  \n0.5µm  \nCell Membrance Thickness  \n20nm  \n8  GCSE Biology Revision Guide  \n• The following structures are common to both animal and plant cells:  \n– nucleus – controls the cell and contains genetic material in the form of chromosomes  \n– cytoplasm – where most chemical reactions take place  \n– cell membrane – a barrier that controls the passage of substances into and out of the cell and contains  \nreceptor molecules  \n– mitochondria – contain the enzymes for cellular respiration and are the site of respiration.  \n• Additionally, plant cells contain:  \n– cell wall – made from cellulose and provides structural support  \n– vacuole – contains cell sap, which provides support  \n– chloroplasts – contain chlorophyll and are the site of photosynthesis.  \nAnimal Cell  \nCell wall  \nCell membrane  \nPermanent  \nvacuole  \nCytoplasm  \nMitochondrion  \nNucleus  \nCytoplasm  \n• Prokaryotes, e.g. bacteria, have no nucleus – the nuclear material lies free within the cytoplasm.  \n• They may contain additional DNA in the form of a plasmid.  \n• Eukaryotes, e.g. human cheek cell, amoeba, plant cell, have a nucleus bound by a nuclear membrane.  \n• In eukaryotes, the cell wall is only present in plant cells.  \nRevise  \nPlant Cell  \nCell membrane  \nChloroplasts  \nNucleus ~~ ~~ Ribosomes  \nA Prokaryote  \n|  Quick Test |\n| --- |\n| 1. The eyepiece lens of a light microscope is ×10 and the objective lens is ×4 . What is the total magnification?\u003Cbr>2. Which part of a cell is:\u003Cbr>a) the site of respiration?\u003Cbr>b) the site of photosynthesis?\u003Cbr>c) a barrier controlling what passes in and out of the cell?\u003Cbr>d) where most chemical reactions take place?\u003Cbr>3. Name two structures found in plant cells, but not in animal cells. |","cbCaidEaW2UnDYIF","https://ap.wps.com/l/cbCaidEaW2UnDYIF","pdf",5777850,1,"English","en",105,"# Cell Level Systems\n## Viewing cells with light microscopy\n## Electron microscopy and higher magnification\n## Measuring scale: µm and nm conversions\n## Structures in animal and plant cells\n## Prokaryotes vs eukaryotes\n## Quick Test","[{\"question\":\"How do light microscopes and staining help you view cells?\",\"answer\":\"Light microscopes allow viewing whole cells and larger subcellular structures. Stains colour whole cells and specific parts such as the nucleus, and a mordant can fix the stain to structures.\"},{\"question\":\"What makes electron microscopes useful for studying subcellular structures?\",\"answer\":\"Electron microscopes use a beam of electrons instead of a lamp, and the specimen is placed in a vacuum. They use electromagnets and provide much higher magnification and detail of structures like ribosomes and membranes.\"},{\"question\":\"What are the main differences between prokaryotes and eukaryotes?\",\"answer\":\"Prokaryotes (e.g. bacteria) have no nucleus; their nuclear material lies free in the cytoplasm and they may contain plasmids. Eukaryotes have a nucleus enclosed by a nuclear membrane, and only plant cells have a cell wall.\"}]","Collins GCSE OCR Biology All-in-One - Cell Level Systems - Exam Revision | PDF",1788602425,3,{"code":4,"msg":30,"data":31},"ok",{"site_id":23,"language":22,"slug":32,"title":13,"keywords":33,"description":14,"schema_data":34,"social_meta":83,"head_meta":85,"extra_data":87,"updated_unix":27},"collins-gcse-ocr-biology-all-in-one-cell-level-systems-exam-revision","",{"@graph":35,"@context":82},[36,51,65],{"@type":37,"itemListElement":38},"BreadcrumbList",[39,43,47,49],{"item":40,"name":41,"@type":42,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":44,"name":45,"@type":42,"position":46},"https://docshare.wps.com/document/","Document",2,{"item":48,"name":12,"@type":42,"position":28},"https://docshare.wps.com/document/exam/",{"item":50,"name":13,"@type":42,"position":11},"https://docshare.wps.com/document/collins-gcse-ocr-biology-all-in-one-cell-level-systems-exam-revision/208096/",{"url":50,"name":13,"@type":52,"author":53,"headline":13,"publisher":55,"fileFormat":58,"inLanguage":22,"description":14,"dateModified":59,"datePublished":59,"encodingFormat":58,"isAccessibleForFree":60,"interactionStatistic":61},"DigitalDocument",{"name":9,"@type":54},"Person",{"url":40,"name":56,"@type":57},"DocShare","Organization","application/pdf","2026-09-05",true,{"@type":62,"interactionType":63,"userInteractionCount":4},"InteractionCounter",{"@type":64},"ViewAction",{"@type":66,"mainEntity":67},"FAQPage",[68,74,78],{"name":69,"@type":70,"acceptedAnswer":71},"How do light microscopes and staining help you view cells?","Question",{"text":72,"@type":73},"Light microscopes allow viewing whole cells and larger subcellular structures. Stains colour whole cells and specific parts such as the nucleus, and a mordant can fix the stain to structures.","Answer",{"name":75,"@type":70,"acceptedAnswer":76},"What makes electron microscopes useful for studying subcellular structures?",{"text":77,"@type":73},"Electron microscopes use a beam of electrons instead of a lamp, and the specimen is placed in a vacuum. They use electromagnets and provide much higher magnification and detail of structures like ribosomes and membranes.",{"name":79,"@type":70,"acceptedAnswer":80},"What are the main differences between prokaryotes and eukaryotes?",{"text":81,"@type":73},"Prokaryotes (e.g. bacteria) have no nucleus; their nuclear material lies free in the cytoplasm and they may contain plasmids. 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