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1697946
Cell Structure
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highers
Mind Map by
harriet colquhoun
, updated more than 1 year ago
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Created by
harriet colquhoun
almost 10 years ago
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Resource summary
Cell Structure
Resolution and magnification achieved by a Light microscope, a TEM and an SEM
Resolution
Light
200nm
TEM
0.1nm
SEM
0.1nm
Magnification
Light
x1500
TEM
x250,000
SEM
x100,000
Difference between Resolution and Magnification
Resolution
Ability to distinguish two separate points as distinct from each other
Magnification
No. of times greater an image is than the object
Need for staining samples
most biological material = transparent
allows specimen to be seen
stains contain chemicals which bind to chemicals on/in specimen
Calculating magnification
mag = Image / actual size
1000um in 1mm
Describe and interpret eukaryotic structures & functions
Nucleus
contains genetic info in DNA of chromosomes
separated from cytoplasm by nuclear envelope with pores for communication between nucleus and cytoplasm
Nucleolus
Production of ribosomes and RNA
dark staining in nucleus
Nuclear Envelope
Contains pores which allow substances out/ in, e.g. ribosomes
RER
Site for ribosomes and transports proteins to Golgi App
SER
makes lipids
Golgi Apparatus
modifies and packages proteins, puts them into vesicles
Ribosomes
Site of protein synthesis, use Amino acids
Mitochondria
site where ATP is made during respiration
Lysosomes
contain powerful digestive enzymes
spherical sacs surrounded by a single membrane
Chloroplasts
site of photosynthesis
Plasma Membrane
separates outside contents from inside cell
Centrioles
Assembles microtubules for cytoskeleton
Forms spindle for mitosis
Undulipodium
enables movement of cells, e.g. sperm cell
Cilia
move substances in a synchronised manor over the surface of a cell
organelles involved in production and secretion of proteins
1) In Nucleus -
Importance of cytoskeleton - mechanical strength, aiding transport, cell movement
Compare/Contrast structure of prokaryotic and eukaryotic cells
Compare/Contrast structure and ultrastructure of plant and animal cells
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