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9175476
B1
Descrição
GCSE Biology Mapa Mental sobre B1, criado por Sachi Sahi em 01-06-2017.
Sem etiquetas
biology
gcse
Mapa Mental por
Sachi Sahi
, atualizado more than 1 year ago
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Criado por
Sachi Sahi
mais de 7 anos atrás
1
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Resumo de Recurso
B1
Cell Structure
Total magnification = magnification of eyepiece/ magnification of object
magnification of image = size of image/ size of object
Highest magnification with light microscope - x1500
nucleus
contains DNA
controls activities of the cell
cell membrane
has receptor molecules
controls what goes in and out of the cell
millimeter = 10^-3m micrometer = 10^-6m nanometer = 10^-9m
eukaryotic cells have a nucleus
plant cell
animal cell
prokaryotic cells don't have a nucleus
Bacteria
Transmission electron microscope
uses electron beam instead of light rays
x1 000 000
Scanning electron microscope
bounces electrons off a surface with an ultra thin coating of heavy metal
only black and white
3D
What happens in cells
DNA
Double helix structure
polymer made up of nucleotides
Deoxyribose + phosphate + base
Adenine - A Thymine - T Cytosine - C Guanine - G
A + T C+G
Protein
Genes have the code for protein
Proteins made from amino acids
DNA unzips to act as a template for mRNA
mRNA leaves nucleus and attaches to ribosome
carrier molecule ferries in an amino acid
Second one comes startes protein chain
The sequence decides which protein it is
Enzymes are biological catlysts
large protein molecule
active sites attach to the substrate
break down large molecule
build larger molecules from smaller ones
change one molecule into another
lock and key
if the shape of the active site changes the enzyme is denatured.
pH
Temperature
substrate concentration
enzyme concentration
Respiration
Organisms need energy to
drive chemical reaction
for movement
maintain body temperature
cell division
active transport
transmit nerve impulses
exothermic
adenosine triphosphate - ATP
energy
38
2
anaerobic used in fermention
glucose + oxygen = carbon dioxide + water
glucose = ethanol + carbon dioxide
glucose = lactic acid
carbohydrases
amylase
mouth, small intestine
protease
stomach
pancreas
lipase
small intestine
Photosynthesis
Scientists
1660 Jan Baptist van Helmont
mass increase wasn't just minerals
1771 Joseph Priestly
plants release oxygen
carbon dioxide + water = glucose + oxygen
endothermic
light + chlorophyll
carbon dioxide and oxygen diffuse through leaves
the thing that makes the graph turn flat is called the limiting factor
Things that can change the rate of photosynthesis
light intensity
water levels
carbon dioxide concentration
temperature
Anexos de mídia
12554624301737124769 Average Prokaryote Cell.Svg.Hi (image/png)
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