Biology F211

Abbie Randall
Mind Map by Abbie Randall, updated more than 1 year ago
Abbie Randall
Created by Abbie Randall over 5 years ago


incomplete F211 mindmap, adding to it as i learn and need to revise for end of topic tests

Resource summary

Biology F211
1 microscopy
1.1 Staining
1.1.1 most biological material is transparent
1.1.2 simple stains include iodine solution this stains starch grains black and other structures yellow methylene blue this stains the nuclei blue
2 Cell membranes
2.1 the fluid mosaic model
2.2 made up of a phospholipid bilayer
2.3 also contains proteins
2.3.1 some are used in faciliated diffusion across the membrane channel proteins forms a tunnel used for water-soluble molecules can be gated carrier proteins change shape to move molecules molecules will bind to the protein
2.4 transport across membranes
2.4.1 active transport movement against the concentration gradient low-->high uses energy from ATP used to pump ions and molecules in and out of cells bulk transport exocytosis substances are packaged by the golgi they are then delivered to the surface by vesicles these fuse with the cell membrane and push out their contents endocytosis some cells take up large molecules- proteins and much larger solid objects like bacteria they do this by enclosing them inside vesicles or vacuoles formed by the cell surface membrane
2.4.2 diffusion occurs passively no energy/ATP required moves down the concentration gradient high --> low molecules will be small and uncharged, to allow for easy passage through the bilayer
2.4.3 osmosis special form of diffusion only occurs with water
2.4.4 water potential the tendency for water to move from high-->low water potential pure water=o always a negative value measured in kPa
3 cell division & mitosis
3.1 stages
3.1.1 4-anaphase centrioles pull this contracts the spindle, pulling chromosomes apart
3.1.2 1- interphase majority of time in this stage around 22 hours in human cell protein synthesis occurs cytoplasm volume increases extra DNA/ organelles made
3.1.3 5-telophase spindle fibres have gone membranes reform chromatids are separate and now called chromosomes chromosomes unwind back into chromatin
3.1.4 3-metaphase no nuclear membrane centrioles are opposite microtubules form nuclear spindle chromosomes move to the spindle and attach by centrometre
3.1.5 2-prophase DNA and chromosomes are packaged chromosomes shorten and thicken makes it easier for chromosomes to move around nuclear envelope begins to break down centrioles move to poles
3.1.6 6-cytokinesis division between two new cells forms animals pinch inward plants form from middle
3.2 yeast budding
3.2.1 mitotic division to produce clones
3.2.2 a vesicle fuses out of the cell nuclei travels to this new bud, then splits
3.2.3 it is normal mitosis until after telophase when this occurs
3.2.4 form of asexual reproduction
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