AS Biology Cell Structure
Cell structure info mind map
- Created by: Sophie Kendall
- Created on: 19-04-13 20:50
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- Cell Structure
- Microscopes
- Light
- Specimen must be thin + transparent
- Can't show very small objects
- Electron
- Shorter wavelengths = 400x better
- TEM = electrons pass through specimen
- SEM = bouncing electrons off specimen
- B&W only
- Speicmen must be dead
- Magnification
- size of image/ real size of object
- Resolution
- degree of detail in an image
- Shorter wavelength = better resolution
- Light
- Structure/ Function of Organelles
- Nucleus
- largest part, usually stained
- contains chromosomes (DNA) - make ribosomes & proteins
- Endoplasmic Reticulum
- RER have ribosomes attached
- RER is where most protein synthesis occurs - proteins collect in cisternae to be moved
- SER in reprod. organs = steroid hormone
- SER in liver = toxins broken down + made harmless
- Golgi Apparatus
- at one side, vesicles fuse; at other side sacs break down into vesicles + move away
- vesicles that fuse are from ER, processed in GA
- endocytosis
- vesicles that remain in cell are lysosomes
- Lysosomes
- tiny bags of digestive enzymes
- fuse with other vesicles for digestion
- Chloroplasts
- plant cells
- ATP + NADPH make carbohydrate
- Mitochondria
- animal + plant cells
- aerobic resp.
- ATP created
- Vacuole
- cell sap contains a variety of substances in solution
- Plasma Membranes
- made up of lipid + protein
- controls what enters +leaves cell
- Centrioles
- animal only
- make + organise microtubules
- Cilia & Flagella
- long, thin extensions that produce movement
- contain microtubules
- mostly animal
- Cytoskeleton
- microfilaments + microtubules create it
- provides strength + directs movement
- Cell Wall
- plant cells
- made of cellulose, held together by pectin
- Nucleus
- Microscopes
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