URGENT!!!!!!! GCSE Science A AQA Biology B1 6th June 2014

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manishah2
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if you have read the specification can you please short it for me and give all the stuff that i need to know for the exam and give me tips on how can i do good in my exams. 3 things i dont get at all are growing bacteria and adult cell cloning and embryo transplants.
thanks. it is urgent so please help.
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Stannisbaratheon
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Ask it biology teacher
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User12345666
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(Original post by manishah2)
if you have read the specification can you please short it for me and give all the stuff that i need to know for the exam and give me tips on how can i do good in my exams. 3 things i dont get at all are growing bacteria and adult cell cloning and embryo transplants.
thanks. it is urgent so please help.
the points on culturing (growing) bacteria:


1. sterilise petri dish, agar jelly and inoculating loop. (agar jelly sterilised with heat and inoculating loop past through bunsen flame) do not blow them to cool them down.
2. this kills any bacteria already present on equipment
3. pour hot agar into petri dish and let cool.
4. Suspend inoculating loop in bacteria you want to culture and apply quickly to agar in a zig zag pattern.
5. seal petri dish quickly to prevent any bacteria in atmosphere entering your culture. Seal with tape leaving small air gaps as to let oxygen in
6. keep in a temperature of around 25 degrees C as this prevents rapid growth of dangerous bacteria.


Adult cell cloning points:


1. remove nucleus from body cell of animal you want to clone
2. remove nucleus from an egg cell and dispose of nucleus
3. place body cell nucleus of animal you want to clone into empty egg cell
4. small electric shock to start division process, allow it to form an embryo
5. place embryo into uterus of the acting mother.
6. offspring is a clone of the original organism the body cell nucleus came from.


Embryo transplant points:


1. the 'prize' sperm and egg cells are taken from the 'prize' animals
2. egg cell fertilised with sperm externally
3. fertilised egg cell is allowed to form embryo
4. when embryo formed, split into a number of different embryos
5. these embryos are then inserted into many acting mothers
6. when born, all new borns are identical but are not clones of the original parents because it took genetic info from both parents (involved the fusing of gametes)
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manishah2
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(Original post by User12345666)
the points on culturing (growing) bacteria:


1. sterilise petri dish, agar jelly and inoculating loop. (agar jelly sterilised with heat and inoculating loop past through bunsen flame) do not blow them to cool them down.
2. this kills any bacteria already present on equipment
3. pour hot agar into petri dish and let cool.
4. Suspend inoculating loop in bacteria you want to culture and apply quickly to agar in a zig zag pattern.
5. seal petri dish quickly to prevent any bacteria in atmosphere entering your culture. Seal with tape leaving small air gaps as to let oxygen in
6. keep in a temperature of around 25 degrees C as this prevents rapid growth of dangerous bacteria.


Adult cell cloning points:


1. remove nucleus from body cell of animal you want to clone
2. remove nucleus from an egg cell and dispose of nucleus
3. place body cell nucleus of animal you want to clone into empty egg cell
4. small electric shock to start division process, allow it to form an embryo
5. place embryo into uterus of the acting mother.
6. offspring is a clone of the original organism the body cell nucleus came from.


Embryo transplant points:


1. the 'prize' sperm and egg cells are taken from the 'prize' animals
2. egg cell fertilised with sperm externally
3. fertilised egg cell is allowed to form embryo
4. when embryo formed, split into a number of different embryos
5. these embryos are then inserted into many acting mothers
6. when born, all new borns are identical but are not clones of the original parents because it took genetic info from both parents (involved the fusing of gametes)


thanks alot. that is very helpful.
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Kitty-meaw
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(Original post by manishah2)
if you have read the specification can you please short it for me and give all the stuff that i need to know for the exam and give me tips on how can i do good in my exams. 3 things i dont get at all are growing bacteria and adult cell cloning and embryo transplants.
thanks. it is urgent so please help.
I don't do AQA'; therefore, won't know the specification and don't even now the specification for edexcel (the exam board that i am doing for), but if you have a revision guide just learn everything of there. That is what i am doing and if you still don't get something on there go on youtube to try and learn it, hope i have helped
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J C
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Does anyone know the thread from edexcel biology B1 13th may, i know im a bit late:confused:
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