B1 - cells topic
- Created by: BlueFireFox
- Created on: 11-11-21 09:21
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- B1 Cells
- Types of cells
- eukaryotic
- cell membrane
- cytoplasm
- nucleus
- prokaryotic
- bacteria (single celled)
- cell membrane
- no nucleus - long circle of DNA, or rings of DNA called plasmids
- cytoplasm
- cell wall (not made of cellulose)
- some have a protective lime capsule
- some have flagella - for movement
- when they multiply they form colonies
- bacteria (single celled)
- specialisation
- nerve
- muscle
- sperm
- root hair
- xylem (dead)
- phloem (alive)
- eukaryotic
- Cells
- animal cells
- nucleus - controls cell activities
- cytoplasm - liquid gel, chemical reactions occur
- cell membrane - what goes in and out
- mitochondria - energy is transferred
- ribosomes - protein synthesis
- plant cell
- has animal structures
- cell wall - rigid, made of cellulose
- chloroplasts - contain chlorophyll, photosynthesis
- permanent vacuole- contains cell sap, keeps cell rigid and supports cell
- animal cells
- Microscopes
- light
- uses beam of light
- magnification : up to 2000x
- used to veiw living objects
- cheap and easy to carry aroud
- resolving power :200nm
- electron
- uses beam of electrons
- magnification : 2000000x
- can't be used on living things
- very expensive, needs to be kept in special conditions
- resolving power : 0.2nm
- light
- Calculations
- magnification : size of image/size of real object
- units
- 1km = 1000m
- 1m = 100cm
- 1cm = 10mm
- 1mm = 1000micrometres
- 1 micrometre = 100 nm
- order of magnitude :using powers of 10
- types of particle movement
- Active Transport
- diffusion of particles across a semi-permeable membrane, with an overall net movement of low to high concentration
- requires energy
- Diffusion
- spreading of particles in a substance with an overall net movement of high to low concentration
- higher temp the faster rate of diffusion
- Osmosis
- diffusion of water across a semi-permeable membrane, with an overall net movement of high to low concentration
- Active Transport
- Types of cells
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