Edexcel BIOLOGY Doubts!!!!

[maryam96]

Thanks

[Joshan9]

I am an private candidate and im writing my A levels in may but im completely and totally lost when it comes to the practical paper. I have no idea how to even begin to answer them questions and i dont even have a teacher for any help im studying biology on my own. I dont know anything about the t test or u test or the chi thing, i keep seeing people talk about them on the forums but wth are they?!?! can someone pleaseeee explain the tests to me in brief or give me some notess pleaseeee and thank youu:)

[DrThamooth]

i got this from somewhere here in this website
if u keep searching u'll find many files that are very useful
this is a summary for the As practicals fr paper 3B
its very useful
go through each one then go do past papers based on it
good luck

[maryam96]

Please can someone help me, why do we cover the explant using a cling film in a tissue culture experiment? Thank you so much!

[NotAbod]

To prevent contamination by bacteria. For this experiment you grow ex-plants on agar which contains nutrients suitable for bacterial growth.

[DrThamooth]

hey guys
who's giving the A2 bio paper tomorrow ?
and how is it ?
and what do you expect to see , what topics might come ? :p

[NotAbod]

I'm doing it.
Not bad.
Anything but I prefer if it has nothing about ecological sampling.

PS: This thread is for doubts. Exam discussion here: https://studentforums.biz/index.php?topic=17305.0

[DrThamooth]

Its not that bad for me too.
its just that time is too short x_x
i hope so too.

I didnt know this thread existed x_x , i shall post things there next time

[conquerpro]

hey guys please answer this for me.how do you extract the cells from a blastocyst?you cant just take the cells from the blastocyst.so whats the method of extraction?

[NotAbod]

You don't need to know how to extract cells from blastocyst. It's about stem cells form unit 2, right? Just take cells from it. How, you don't need to know. You can check the specification for more info.

[conquerpro]

You don't need to know how to extract cells from blastocyst. It's about stem cells form unit 2, right? Just take cells from it. How, you don't need to know. You can check the specification for more info.

thanks a lot.i was really worried

[Lawendy23]

if there is anyone looking at this message please i need major help for tomorrow's AS biology 2, Dev, plants and the environment. First a link to a legit list of the specifications and please a site that can help me revise! im so worried 

[NotAbod]

if there is anyone looking at this message please i need major help for tomorrow's AS biology 2, Dev, plants and the environment. First a link to a legit list of the specifications and please a site that can help me revise! im so worried 

Specification from edexcel: http://www.edexcel.com/migrationdocuments/GCE%20New%20GCE/UA024831%20GCE%20in%20Biology%20Issue%204%20250510.pdf


Biology resources: https://studentforums.biz/index.php?topic=10275.0

[conquerpro]

someone please describe the totipotency in plant cells experiment.please

[NotAbod]

someone please describe the totipotency in plant cells experiment.please

You are required to know how to carry out an experiment to know if plant cells are totipotent or not.
You must know what totipotency means.
But, you don't have to describe totipotency in plant cells. I don't really get your question.