Edexcel AS Biology - 6B101 + 6B102 - Unit 1 and Unit 2 Exam Discussion Thread

I need help!!!

I don't know the regulatory authorities for the use of embryonic stem cell.

Can anyone explain it to me please, it may come up in the exam?

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Reply 1782

Leah97

3

Original post by Medically

I need help!!!

I don't know the regulatory authorities for the use of embryonic stem cell.

Can anyone explain it to me please, it may come up in the exam?

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reason for regulatory of authority - to decide the max age of an embryo which is allowed for research.
- to judge what is acceptable and what isn't when researching.

Reply 1783

Original post by Medically

I need help!!!

I don't know the regulatory authorities for the use of embryonic stem cell.

Can anyone explain it to me please, it may come up in the exam?

Posted from TSR Mobile

Regulatory authorities...

1) Look at proposals of research to see if they should be allowed
2) Monitor and Licence research centres
3) Provide guidelines and codes of practice
4) Monitor developments
5) Give advice to governments and professionals

Hope that helps you :h:

Reply 1784

Buz1234

Do we need to know the process of transpiration of water through xylem? If so can someone explain it

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Reply 1785

PlayerBB

17

Original post by shooting_stars

Independant assortment means that at the end of telophase 2 in meiosis, different combinations of chromosomes has the ability to go into different gametes. So each gamete will have a different combination of chromosomes and this leads to genetic variation.

Thank!

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Reply 1786

Indigo.Brownhall

1

Original post by Buz1234

Do we need to know the process of transpiration of water through xylem? If so can someone explain it

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water vapour diffuses out of the stoma down the concentration gradient.
Water evaporates from the surfaces of cells lining the substomatal cavity.
Water replaced by means of capillary action within the cell walls
water is drawn out of the xylem
a continuous column of water is drawn up through the xylem due to the cohesion-tension theory.

Reply 1787

Romanoff

Original post by Buz1234

Do we need to know the process of transpiration of water through xylem? If so can someone explain it

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No, you can find the specification here:

http://qualifications.pearson.com/content/dam/pdf/A%20Level/Biology/2013/Specification%20and%20sample%20assessments/9781446910702_GCE_Lin_Biology_Issue_6.pdf

Unit 2 starts from page 32.

Reply 1788

Tazmain

8

Hey guys,

Have anyone got the link to the January 2015 Unit 2 paper, w/ markscheme?

Reply 1789

Neuth

19

Original post by Romanoff

No

We do need to know it.

Original post by Buz1234

Do we need to know the process of transpiration of water through xylem? If so can someone explain it

Yes, we do :yep:

Somebody has already helped you out with it, so I wont post it again.

Reply 1790

Original post by Neuth

We do need to know it.

Yes, we do :yep:

Somebody has already helped you out with it, so I wont post it again.

But it's not in the spec for Unit 2 Topic 4 :s-smilie:

Can you exactly show me which specification point you are talking about?

Reply 1791

Indigo.Brownhall

1

Original post by shooting_stars

But it's not in the spec for Unit 2 Topic 4 :s-smilie:

Can you exactly show me which specification point you are talking about?

If you have the orange Edexcel biology Text book it is on page 179-180

Reply 1792

Neuth

19

Original post by shooting_stars

But it's not in the spec for Unit 2 Topic 4 :s-smilie:

Can you exactly show me which specification point you are talking about?

"5 Compare the structures, position in the stem and function ofsclerenchyma fibres (support) and xylem vessels (support andtransport of water and mineral ions)."

My teacher e-mailed the exam board and asked for clarification, and they explained that we do need to know all of that (transpiration, lignification etc.) as it is part of the transport of water.

Reply 1793

Original post by Indigo.Brownhall

If you have the orange Edexcel biology Text book it is on page 179-180

But the book has some things that we don't really need like extra knowledge.. This is not in the specification so they can't test us on it..

Reply 1794

Original post by Neuth

"5 Compare the structures, position in the stem and function ofsclerenchyma fibres (support) and xylem vessels (support andtransport of water and mineral ions)."

My teacher e-mailed the exam board and asked for clarification, and they explained that we do need to know all of that (transpiration, lignification etc.) as it is part of the transport of water.

Oh no.. I havent learnt anything about that at all... I thought it was just that we need to know xylem vessels are used to transport water and for structural support and thats it.. We weren't taught this at school :frown:

Reply 1795

mismash

Original post by Neuth

"5 Compare the structures, position in the stem and function ofsclerenchyma fibres (support) and xylem vessels (support andtransport of water and mineral ions)."

My teacher e-mailed the exam board and asked for clarification, and they explained that we do need to know all of that (transpiration, lignification etc.) as it is part of the transport of water.

would anyone be able to explain this spec point please??

(edited 8 years ago)

Reply 1796

Original post by Leah97

reason for regulatory of authority - to decide the max age of an embryo which is allowed for research.
- to judge what is acceptable and what isn't when researching.

Thank you. 😊

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Reply 1797

Original post by shooting_stars

But it's not in the spec for Unit 2 Topic 4 :s-smilie:

Can you exactly show me which specification point you are talking about?

And thank you as well😊

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(edited 8 years ago)

Reply 1798