What 3 molecules can pass through cell membranes and what 2 can't?
3: water, amino acids, glucose 2:proteins, starch
1 of 13
whats the sceintific name for a group of similar cells?
tissue
2 of 13
why are enzymes called biological catalysts?
they speed up rate of reaction and organisms produce them
3 of 13
what does lipase breakdown and where is it made?
fats into fatty acids and glycerol, lipase is made in the pancrease and small intestine
4 of 13
why is it easier for stem cells from embryo's to differentiate rather than from bone marrow?
It's because a operation is needed to extract the stem cells also bone marrow stem cells can only differentiate into blood cells to treat diseases like leukemia.
5 of 13
name two reasons why some people are against extracting stem cells from embryos?
because they believe its violating human dignity and that it's deystroy a potential life
6 of 13
whats unaltered preservation?
when conditions for decay aren't avaible e.g. peat bog
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what are moulds and casts?
its when other materials begin to replace organism and turns into rock
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whats mineral replacement?
when hard parts of an organism such as shells and bones don't decay properly.
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what are trace fossils?
these are things like footprints etc left by the organism
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why don't we have a lot of evidence of early life on earth?
most of the first organisms where soft bodied.
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what can cause a specie to evolve into another specie?
this can happen is isolation occurs which could be things like mountains or rivers. It means that genes can't be exchanged.
12 of 13
3 differences between meiosis and mtosis?
meiosis: happens in sexual reproduction, makes 4 daughter cells and divides twice mitosis: happens in asexual reproduction, divides once produces 2 genetically identical daughter cells
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Other cards in this set
Card 2
Front
whats the sceintific name for a group of similar cells?
Back
tissue
Card 3
Front
why are enzymes called biological catalysts?
Back
Card 4
Front
what does lipase breakdown and where is it made?
Back
Card 5
Front
why is it easier for stem cells from embryo's to differentiate rather than from bone marrow?
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