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2727858
OCR: AS Biology: F211
Description
Mind Map on OCR: AS Biology: F211, created by Sophie Evans on 14/05/2015.
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ocr
as level
biology
f211
Mind Map by
Sophie Evans
, updated more than 1 year ago
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Created by
Sophie Evans
about 9 years ago
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Resource summary
OCR: AS Biology: F211
Microscopy
Resolution
Definition
How well it can distinguish between two points close together
Light Microscope
200nm
TEM
0.1nm
SEM
0.1nm
Magnification
Light Microscope
x1500
TEM
x500,000
SEM
x100,000
Definition
How much bigger the image is than the specimen
Staining
Used with light microscope
Chemicals bind to specimen, allowing it to be seen
Some bind to specific structures
Makes recognition easier
Acetic orcein staining DNA red
EM create black and white images
Dipped in heavy metals (e.g. lead)
Creates a contrast
Cell Structure
Membranes
Fluid Mosaic Model
Phospholipid Bilayer
Hydrophilic tail
Hydrophobic head
Small, non-polar substances diffuse through
Cholesterol
Lipid
Membrane stability
Binds to tails so it's less fluid
Proteins
Control what leaves/enters cell
Channel Proteins
Smaller ions and polar molecules
Used in diffusion
Sometimes facilitated
Carrier Proteins
Facilitated diffusion
Large molecules and ions
Down concentration gradient
Active Transport
Against concentration gradient
Uses ATP
Glycolipids/ Glycoproteins
Cell Signalling
Hormones bind to complimentary receptor
Communication between cells
Antigens
Cell Surface
Plasma membranes
Partially permeable
Allow substances to move in and out
Within cells
Separate organelles
Folded- increase surface area
Vesicles to transport substances around
Organelles
Nucleus
Prokaryotic VS Eukaryotic
Breathing
Transport: Animals
Transport: Plants
Cell Division
Media attachments
ab3d0faa-ca02-4f1f-b8c3-4f6d70450356 (image/jpg)
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