cell biology Flashcards
whats diffusion
the random movement from a region of high concentration to low concentration through a partially permamble membrane
what is osmosis
the diffusion of water molecules from a dilute solution to low concentraion of water across a selectively permamble membrane
features of prokaryotic cells
no true nucleus, free dna, no organelles, 0.1-5um(size)
features of eukaryotic cells
nucleus, 10-100 um, organelles
features of stem cells
used in dementia and lukemia, is a undifferentiated cell, not specalised, high success rate
what is the nucleus
brain of the cell
what is the cell membrane
contains what enters and exits
cell wall
supports, gives structure
cytoplasm
makes easy pasage
mitrochondria
takes in nutrients/energy
vacuole
stores water/keeps shape
chloroplasts
absorbs light for photosynthesis
ribosomes
proteins made
what do plant cells contain
nucleus, cytoplasm, ribosomes, cell membrane, mitrochondria
what do animal cells contain
nucleus, chloroplasts, cell membrane, cell wall, mitrochondria
what do plant cells contain that the animal cell dont
cytoplasms, ribosomes
what do animal cells contain that the plant cells dont
cell wall, chloroplasts
what is the first step of the cell cycle
1.cell grows
what is the second step of the cell cycle
2.dna replicates to form two copies of each chromosome
what is the third step of the cell cycle
further growth, dna checked and repaired
what is the fourth step of the cell cycle
mitosis(chromosome move about and two nuclei form
what is the fifth step of the cell cycle
cytoplasm divides into two, new cell membrane seperates to give two identical cells
what is the last step (sixth) of the cell cycle
temporary cell resting (no division)
