cells🔬 Flashcards

1
Q

transmission electron microscope magnification

A

x500 000

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2
Q

resolution definition

A

see detail, ability to distinguish between 2 objects

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3
Q

why do mitochondria look different in microscope

A
  • mitochondria vary in shape

- cut in different angles

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4
Q

how does cytoskeleton allow movement of organelles

A

microtubules

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5
Q

how to ensure chromatography goes well

A
  • 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
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6
Q

difference between electron and laser confocal scanning microscopes

A

lcsm has lower resolution
can see different layers and movement
fluorescent tag

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7
Q

how can you tell cells are in prophase

A
  • chromosomes condensed
  • not organised
  • no visible nucleolus
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8
Q

how does organsiation of homologous chromosomes in metaphase 1 create variation

A
  • independent assortment
  • homologous chromosomes have different alleles
  • homologous chromosomes line up on equator
  • chromosomes in pair are randomly assigned to either pole
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9
Q

ethical issues with embryonic stem cells

A

embryo is destroyed

embryo cannot consent

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10
Q

function of a ring of contracting protein around centre of bacteria

A

cell division/cytokinesis

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11
Q

function of protein which makes bacteria curved

A

maintains cell shape

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