BIOLOGY unit 2 doubts here =]

[U stalking ME]

are u guys talking about o levels biology (5090) here? bcuz all of this stuff seems irrelevant please tell me *getting scared* :/

nope we r talking abt AS EDEXCEL Biology

 

[daredevil]

nope we r talking abt AS EDEXCEL Biology

Oh thank GOD!!! *phew* but y r u guys dicussing AS EDEXEL in the CAMBRIGE O LeVELS forum??

 

[U stalking ME]

Oh thank GOD!!! *phew* but y r u guys dicussing AS EDEXEL in the CAMBRIGE O LeVELS forum??

hmmm i think ur mistaken this is Edexcel forum not cambridge o levels forum, u r in the wrong place buddy

 

[maths maldives]

In "antimicrobial properties of plant extract" experiment, there is a question
-why the agar plates are incubated for 24 hours?

 

[U stalking ME]

In "antimicrobial properties of plant extract" experiment, there is a question
-why the agar plates are incubated for 24 hours?

The plate was incubated for 24 hours to allow microbial growth to an extent where their colonies become visible.

 

[Wearewhoweare]

I think the paper is gonna be difficult :/ just like the unit 1..

 

[U stalking ME]

I think the paper is gonna be difficult :/ just like the unit 1..

dont say that

 

[Wearewhoweare]

dont say that

LOOL i hope not though!

 

[U stalking ME]

LOOL i hope not though!

INSHALLAH it will be good

 

[Wearewhoweare]

Inshallah btw what are the main things we have to learn about stem cells?

 

[Vj Destiny]

Anyone's got useful notes for unit 2? :/

 

[U stalking ME]

Inshallah btw what are the main things we have to learn about stem cells?

wat r stem cells?
sources of pluripotent and totipotent stem cells
explain pluripotentcy and totipotentcy. compare them
ethical, social etc issues of embryonic stem cells
totipotency experiment
explain how unspecialised cells turn into specialised cells due to differential gene expression
issues relating to the use of embryos to harvest these stem cells and their use in medical therapies

 

[U stalking ME]

Anyone's got useful notes for unit 2? :/

this site is pretty good, but for half of unit 2(only green chaps), for blue ones go through study guide questions; http://www.brain-freeze.co.uk/files/Edexcel Unit 2 Revision Notes.pdf

 

[Wearewhoweare]

wat r stem cells?
sources of pluripotent and totipotent stem cells
explain pluripotentcy and totipotentcy. compare them
ethical, social etc issues of embryonic stem cells
totipotency experiment
explain how unspecialised cells turn into specialised cells due to differential gene expression
issues relating to the use of embryos to harvest these stem cells and their use in medical therapies

ahhh okay what a useful list! thats good i know everything there thanks your so kind

 

[U stalking ME]

ahhh okay what a useful list! thats good i know everything there thanks your so kind

no prob Gud luck for tom

 

[Vj Destiny]

this site is pretty good, but for half of unit 2(only green chaps), for blue ones go through study guide questions; http://www.brain-freeze.co.uk/files/Edexcel Unit 2 Revision Notes.pdf

Thankx

 

[U stalking ME]

Thankx

welcome

 

[Wearewhoweare]

no prob Gud luck for tom

Thanks! you too

 

[moonlight856]

in January 2012 , Question 4(i), it states that we need to plot the error bar, how to do do that, how do we determine the error ?

 

[U stalking ME]

in January 2012 , Question 4(i), it states that we need to plot the error bar, how to do do that, how do we determine the error ?

In the table they gave the length of 5 pollen grains which were all treated at 10% conc.
We plot the mean value that is 700 and then plot the lowest value given that is 680 which forms the lower error value limit and then plot the highest value given that is 720 which forms the higher error value limit.