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Biology GCSE Definitions
Member rating: No Rating | Words: | Submitted: Tue Mar 15 2005
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UNIT 1 - Foundation Cell structure 1 um is a micrometer and 10-6 of a meter ie 0.000 001 1 nm is a nanometre and 10-9 of a meter ie 0.000 000 001 Plant cell contains extra - vacuole - controls osmotic properties and contains minerals vitamins etc. - Chloroplast - do photosynthesis contain starch grains and granum (piled up stroma which actually do the photosynthesising) - Cell wall, to stop cell exploding! Nucleus - surrounded by nuclear membrane (nuclear envelope) - contain pores for mRNA to travel, and for entry of hormones - Nucleolus produces ribosome's to produce proteins etc. Centrioles - are hollow cylinders, used in cell division ER - the membranes from a system of flat sheets called cisternae, they can then from Golgi apparatus - Ribosome's on the roughER produce proteins and then transported by the roughER - SmoothER produces lipids and steroids (cholesterol and reproductive hormones Golgi - they are first smoothER then bud off to from golgi vesicles - They sort...
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