cell structure

• the nucleolus is the site for subunit ribosome synthesis
• a transmission electron microscope uses electromagnetic lenses instead of glass
• 1000 nanometres= 1 micrometre
• 1000 micrometres = 1mm
• a red blood cell is approx. 7.5 micrometres
• red blood cells are electron dense due to high amounts of haemoglobin
• in between the plasma membranes is intercellular space
• under a LM, you can find the nucleus, chromatin, chromosomes and nucleous
• chromatin indicates different cell types
• under an EM, you can find nucleus, nuclear membrane, nuclear pores, chromatin, chromosomes and the nucleolus
• the two types of chromatin are euchromatin and heterochromatin
• increased heterochromatin means the cell is less synthetically active
• nuclear pores allow ribosomal subunits out of the nucleus and into the cytoplasm to associate with ribosomes
• heterochromatin is condensed and is not being actively used in transcription
• the more euchromatin there is, the more mRNA is being produced by the cell
• CM can't be seen in eosinophils or basophils
• heavy metals bind to condensed tissue
• nerve cells can be up to 100um
• lipids are amphipathic
• proteins and glycoproteins cause cell membrane to appear eosinophilic