Summary OCR A-Level Biology - Cell Division and Organisation
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Course
Cell Division and Organisation
Institution
OCR
Hand-written summary notes using Seneca on the whole of Cell Division and Organisation in Module 2 - Foundations in biology, OCR A-Level Biology (H420). This includes an overview on the cell cycle; mitosis; meiosis; cell specialisation; levels of organisation; stem cells.
Happy revising! :)
we cycle
cell
cycle is a
precisely
series of timed and carefully regulated stages of growth/DNAreplication/
division thatcells progress through
interphase involves cell growth and replication
DNA
interphase is sub-divided into 3 growth stages:61/S/62
61involves cell growth
S involves DNA
synthesis
62 involves further cell
growth before mitotic phase
mitotic phase involves separation of replicated and
DNA cytoplasmic contents as the cell divides
enkaryotic cells divide produce
to 2 daughter cells with identical copies of DNA produced by
the parent cell during DNA
replication
multicellular organisms go through mitosis to grow and repair damaged tissues
we
cycle regulation
internal checkpoints regulate the cell cycle
61Checkpoint
checks DNA
to ensure no
damage
cell size checked
cell checked for enough energy reserves
62 checkpoint
chromosomes checked to ensure all replicated
duplicated checked
DNA to ensure none is
faulty
M checkpoint
check sister chromatics attachmentto spindle is suitable
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