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Biology (cell biology (key facts (37.2 trillion cells in a human body, 200…
Biology
cell biology
key facts
37.2 trillion cells in a human body
200 different types of cells
all come from a single egg cell
70 billion cells die and are replaced each day
dust = 99.9% dead skin cells
cell structure
animal
cell membrane
nucleus
ribosomes
mitrocondria
plant
cell membrane
cell wall
mitrocondria
nucleus
ribosomes
vacoul
chloroplasts
bacteria
chromosomal dna
plasmid dna
cell membrane
cell wall
flagellum
not always present
uses of parts of a cell
Eukaryotes and Prokaryotes
eukaryotes
membrane bound nucleus
chromosomes are linear
linear dna is tightly packed around proteins
prokaryotes
no membrane bound nucleus
singular circle chromosome
extra circles of DNA (plasmids)
mitosis/ miosis
mitosis
cell division
most cells are made in this way
after splitting both cells have identical DNA
miosis
production of gametes (sex cells)
4 gametes are made each with only 23 chromosomes
bioenergetics
infection and response
organization