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IB SL Biology: Cells
Descrição
Mapa Mental sobre IB SL Biology: Cells, criado por mcgowan-w-10 em 27-05-2014.
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ib
biology
cells
sl biology
sl bio
Mapa Mental por
mcgowan-w-10
, atualizado more than 1 year ago
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Criado por
mcgowan-w-10
mais de 10 anos atrás
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Resumo de Recurso
IB SL Biology: Cells
Cell Theory
1. All living organisms are composed of cells
2. Cells are the smallest unit of life
3. Cells come from pre-existing cells
Proof
One sealed soup container: no decay
Other open soup container: decay
Bacteria in air
Multicellular organisms
Differentiation
Cells specialise in different functions
Genes needed to specialise
Once specialised, cell is committed
Exhibits emergent properties
More than sum of parts - complex interations
Unicellular
Single cell = all functions of life
Amoeba
Euglena
Chlorella
Stem Cells
Retain ability to differentiate along different pathways
Small number of embryonic cells still retained by adult body
Potential for tissue repair
Cord blood for leukaemia
Skin grafts
Heart regeneration
Therapeutic use: bone marrow transplant as a result of chemotherapy
Cell Size
SA:Vol ratio
Smaller animals - poor
Heat loss - big issue
Bigger animals - good
Lungs + gills
Prokaryotic Cells
"Before the nucleus"
Cell Wall
Prevents damage
Retains structure
Plasma Membrane
Controls entry and exit of substances
Cytoplasm
Site of biochemical reactions
Pili
Hair-like structure
Connect bacteria together
Flagella
Propels cells
Ribosomes
Synthesise proteins
Translation of messenger RNA
70 S
Nucleoid
Naked DNA
Binary fission
Eukaryotic Cells
Nucleus
Stores genetic information
Chromosomes
Strands of DNA associated with protein
4+
Mitochondria
Carry out aerobic respiration
Lysosome
Stores digestive enzymes
Rough endoplasmic reticulum
Synthesises proteins for secretion from cell
Golgi Apparatus
Processes proteins before secretion
Plasma Membrane
Controls entry and exit of substances
Free ribosomes
Synthesise proteins for use in the cytoplasm
80 S
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