Could you tell me the difference between Mitosis and Meosis please

crana

Either way, humans are the animal species we learn most about, and it's just wrong to suggest that "4 eggs are formed" in humans from meiotic division of one oocyte. Which is what they do suggest.

Rosie

That is true - unfortunately it is by no means the only fallacy in A level biology! Ever heard of the mesosome?

Ben

Reply 24

Helenia

20

Tribi18

so,

what is the difference between Mitosis and Meiosis?

just a really simple, GCSE answer will be sufficent thanks :smile:

Read what I wrote right at the top.

Reply 25

Ben.S.

That is true - unfortunately it is by no means the only fallacy in A level biology! Ever heard of the mesosome?

Ben

Yes, well, the probably-wrong version.. if i remember rightly they are infolds of the membranes of prokaryotic cells that can be specialised to do different things a bit like some of the organelles in eukaryotic cells?

but id be really interested to hear what's "wrong" with it!

Rosie

Reply 26

crana

Yes, well, the probably-wrong version.. if i remember rightly they are infolds of the membranes of prokaryotic cells that can be specialised to do different things a bit like some of the organelles in eukaryotic cells?

but id be really interested to hear what's "wrong" with it!

Rosie

Nicely recited - full marks.
However - they don't exist. Simple as that. They are artefacts, produced as a consequence of the method use to view the bacteria (something to do with vacuums and things). Although the membrane supports energy transduction and lipid biosynthesis etc. (thanks to the SA/V ratio in such a small cell), the invaginations are purely artificial!

Ben

Reply 27

Ben.S.

Nicely recited - full marks.
However - they don't exist. Simple as that. They are artefacts, produced as a consequence of the method use to view the bacteria (something to do with vacuums and things). Although the membrane supports energy transduction and lipid biosynthesis etc. (thanks to the SA/V ratio in such a small cell), the invaginations are purely artificial!

Ben

why thank you - my report said I needed to rely more on learning answers by rote - can you tell.....?

Sooooo you know things like nitrogen fixation and whatever else mesosomes are meant to do......where are they actually done? unless you meant that they can vbe carried out as one of the "etcs" but just using the membranes as supports?

the mesosomes aren't at all special in any way then, they are just bog standard bits of scrunched up membrane?

rosie

Reply 28

crana

why thank you - my report said I needed to rely more on learning answers by rote - can you tell.....?

Sooooo you know things like nitrogen fixation and whatever else mesosomes are meant to do......where are they actually done? unless you meant that they can vbe carried out as one of the "etcs" but just using the membranes as supports?

the mesosomes aren't at all special in any way then, they are just bog standard bits of scrunched up membrane?

rosie

They are carried out in the membrane or cytosolically. Yep, just scrunched up bits of membrane - scruched up because of the way microscopists view them.

Ben

Reply 29

Ben.S.

They are carried out in the membrane or cytosolically. Yep, just scrunched up bits of membrane - scruched up because of the way microscopists view them.

Ben

right
just wondering, have you got any good books-i-might-be-able-to-find or websites etc that mention this? I can look for my own, I just thoughtyou might know of some.

only i do love a good argument with my teachers :smile:

(im meant to communicate any questions in writing to the head of dept now. but y'know.)

rosie
ps. are you at uni/been to uni/to do what& where?

Reply 30

GH

13

This is very very interesting. Artefacts...

What otehr surprising facts do you have Ben?

Reply 31

I'm a BioNatSci at Cambridge. Books...er...well - the one I use is Alberts et al: Molecular Biology of the Cell. That's not very interesting though - well, I don't think so anyway. I can't think of any more 'surpirsing facts', although one thing I did find odd was that action potentials were first observed in plants, not animals.

Ben

Reply 32

Ralfskini

10

Ben.S.

I'm a BioNatSci at Cambridge. Books...er...well - the one I use is Alberts et al: Molecular Biology of the Cell. That's not very interesting though - well, I don't think so anyway. I can't think of any more 'surpirsing facts', although one thing I did find odd was that action potentials were first observed in plants, not animals.

Ben

wow! I didnt even know plants had nervous systems. At least my biology teacher didnt know whether they did when I asked her. :rolleyes:

Reply 33

Ben.S.

I'm a BioNatSci at Cambridge. Books...er...well - the one I use is Alberts et al: Molecular Biology of the Cell. That's not very interesting though - well, I don't think so anyway. I can't think of any more 'surpirsing facts', although one thing I did find odd was that action potentials were first observed in plants, not animals.

Ben

ive got a copy of molecular cell biology by lodish ill look in there. ive applied to do bio natsci too, if i make my offer ill be starting at pembroke in Oct. what college are you at?

rosie

Reply 34