Qualification > Sciences
Edexcel BIOLOGY Doubts!!!!
Ibiza279:
--- Quote from: kim on June 07, 2010, 09:28:54 pm ---ok welll
MAOA is monoamine oxidase A
it break downs nuero transmitter such as serotonin and dopamine
if the level of MAOA is raised or decreased it causes mutations
low levels -nervous disorder
dependance on alcohol
parkinsons disease
high levels-risk takin and aggressive behavior
tension favors high release of MAOA
and maltreatment causes low release
this enzyme is produced with the help of a dominate gene located on the X chromosome
if there is to much of this enzyme it breaks down too many of the nuerotransmitters which can affect ur mood
hence it is linked with depression
--- End quote ---
but i remember MAOA being majorly in males so shouldnt it b on the Y chromosome ? :o i could b wrong
Kim:
--- Quote from: Ibiza279 on June 07, 2010, 09:37:31 pm ---but i remember MAOA being majorly in males so shouldnt it b on the Y chromosome ? :o i could b wrong
--- End quote ---
haha i just checked it is on the X chromosome
so girls have double the chance of getting it
Ibiza279:
--- Quote from: kim on June 07, 2010, 09:36:52 pm ---hahaha dont worry
i havent forgotten ya
thank you
well for mitosis i am afraid there is no easy u will have to learn it
but i will type my notes out for ya maybe they will help
for the gene expression cud u be a little more specific??
--- End quote ---
well i did one of the papers and there was a question regarding gene differentiation. when i checked the mark scheme, they gave the points as for example, a stem cell in a particular part of the body requires production of ATP for instance. so a few of the genes which aid in ATP synthesis are EnViRnoMeNtAlLy activated. these cause the specific protein to b synthesized and so it changes it state of pluripotency and forms a speciallised cell. i read this a long time ago so my explanation is abit vague,
as fer the others, don't actually read my explanation unless u can explain it to me :P cause it mite give the wrong idea so plz, i don't wanna b the reason if such a question comes up n my explanation which U hav memorized, goes wrong :(
Ibiza279:
--- Quote from: kim on June 07, 2010, 09:43:21 pm ---haha i just checked it is on the X chromosome
so girls have double the chance of getting it
--- End quote ---
who are the greatest criminals ? MEN, who are the ones who normally commit murders ? MEN, wats PRISON BREAK about ? mostly MEN :o :P but if the book says women then its alrite, the media tends to show things differently :P
Kim:
haha ok i will get to that
mwahahaha i got lazy so i scanned my ntbk
hehe hopefully u can read my notes
if u cant do tell
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