cells🔬 Flashcards
transmission electron microscope magnification
x500 000
resolution definition
see detail, ability to distinguish between 2 objects
why do mitochondria look different in microscope
- mitochondria vary in shape
- cut in different angles
how does cytoskeleton allow movement of organelles
microtubules
how to ensure chromatography goes well
- clip paper onto rod to sit on top of beaker to keep it at a constant height
- repeat and find mean Rf to improve acccuracy
- place lid over beaker to prevent evaporation
- spots on separate papers to prevent clashing
difference between electron and laser confocal scanning microscopes
lcsm has lower resolution
can see different layers and movement
fluorescent tag
how can you tell cells are in prophase
- chromosomes condensed
- not organised
- no visible nucleolus
how does organsiation of homologous chromosomes in metaphase 1 create variation
- independent assortment
- homologous chromosomes have different alleles
- homologous chromosomes line up on equator
- chromosomes in pair are randomly assigned to either pole
ethical issues with embryonic stem cells
embryo is destroyed
embryo cannot consent
function of a ring of contracting protein around centre of bacteria
cell division/cytokinesis
function of protein which makes bacteria curved
maintains cell shape