module 2 reds Flashcards
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image/real
how does the cytoskeleton move organelles around the cell
microproteins bind to and move along microtubules
functions of the cytoskeleton
structure of cell, movement of cilia and flagella, movement of organelles, movement of chromosomes, formation of spindle fibres
structures associated with cytoskeleton
flagella, cilia, microtubule, microfilament
why is detergent added in dna purification
disrupts phospholipid bilayer
why is protease added in dna purification
breaks down histones
why is ice cold ethanol added in dna purification
allows precipitate formation
why would you grind a leaf before dna purification
to release cells’ contents
what makes the fluid mosaic model fluid
lateral movement of phospholipids within bilayer
which component of the plasma membrane is primarily responsible for its selective permeability?
phospholipid bilayer
structure of fluid mosaic model
phospholipid bilayer with hydrophobic tails and philic heads, move laterally
outline the role of membranes within cells
compartmentalisation, site of chemical reactions, attachment sites for chemicals, maintain conc gradients
which molecules can cross the cell surface membrane
hydrophobic and lipid soluble
what happens at the g1 checkpoint
cells with damaged dna stopped from entering s phase
what happens at the metaphase checkpoint
checks chromosomes attached to spindle fibres
what happens at the g2 checkpoint
checks cell size, dna rep and damage
sperm cell adaptations
many mitochondria, enzymes
erythrocyte adaptations
no organelles, haemoglobin
neutrophil adaptations
lysosomes, many mitochondria, well developed cytoskeleton, lobed nucleus
palisade cells adaptations
box shaped, thin cell walls. large vacuole
root hair cell adaptations
long extensions
guard cells adaptations
change shape when water lost so stomata close, wall thicker on one side
squamous epithelium adaptations
thin
ciliated epithelium adaptations
hair like structures, goblet cells
