LCA pre-ap biology cell division
Terms in this set (47)
why do cells need to divide?
growth, healing, and replacement
why is surface area and volume important for cell sizes?
cells are limited by their surface area and volume ratio causing the cell membrane can't be able to maintian a cell after it gets to a certian size
form of DNA that condenses prior to mitosis or meiosis
form of DNA in interphase
location holding 2 chromosomes together
name given to chromosomes when identifying them as sisters or nonsisters
what are the three cycles of the cell cycle
interphase, mitosis, cytokinesis
what stage does the cel spend most of their life in
how many chromosomes are i the human body before DNA replication
how many chromosomes are in the human body after DNA replication
what occurs in G1
normal cell growth
what occurs in S
replicating of DNA
what occurs in G2
doubling of organelles
what is the order of motosis
prophase, metaphase, anaphase, telophase (PMAT)
what happens in prophase?
chromosomes become visible
what happens in metaphase
chromosomes line up
what happens in anaphase
chromosomes are split
what happens in telophase?
nuclear membrane forms
what is cytokenisis
division of the cytoplasm
how is cytokenesis different between plants and animals
plants have a cell wall so they have to develope a "cell plate" in between the two cells, and animal cells just form a cell membrane
uncontroled cell growth
what regulates/ limits the cell cycle
cell cycle regulators
what are the three cell cycle regulators
cyclins, internal regulators, external regulators
what do cyclins do?
regulate the timing of the cell cycle
what do internal regulators do?
proteins that respond to events inside the cell
what do external regulators do?
protiens that respond to events outside of the cell
what causes cancer
cells do not respond to the signals that regulate the growth of most cells
what are stem cells?
unspecialized cells that have the potential to become any kind of cell
where do stem cells come from
human embryos, some adult cells, umbilical cord blood
what can stem cells hopefully cure?
injuries (brain, spinal cord) diseases (diabetes) replace organs (liver tissue, heart valves)
what are the two goals of meiosis
genetic variability, and 4 haploid cells
which stage does genetic variability take place in and how?
meiosis 1, crossing over
which stage does the 4 hapliod cells take place in and how?
meiosis 2, mitosis
where does mitosis take place in?
everywhere except testes and ovaries
what type of cell does mitosis have?
how many cells does mitosis end with?
how many chromosomes does mitosis end up with
is mitosis end with a hapliod or dipliod
is mitosis genetically identical or different?
when does mitosis begin
where in the body does meiosis occur?
testes and ovaries
what type of cells are in meiosis?
sex cells (gamete)
how many cells does meiosis end with?
how many chromosomes does meiosis end with?
does meiosis end with a hapliod or diploid?
is meiosis genetically identical or different?
when does meiosis begin?
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