[Official Thread] Edexcel 6BI02 (Unit 2 Old Spec) June 2016 (Exam Discussion)

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Reply 20

Loody Nagy

Another question...How do you explain thrombosis? How is it different from atherosclerosis?

Reply 21

Arnaez3

Original post by Haddar

All you need for unit 2.

do you have anything similar for unit 1?

Reply 22

Haddar

Original post by Arnaez3

do you have anything similar for unit 1?

Wont let me upload file to big -_-

Reply 23

Haddar

Original post by Loody Nagy

Another question...How do you explain thrombosis? How is it different from atherosclerosis?

Atherosclerosis is the name for a condition that occurs when plaques form on the inner lining of the blood vessels. It is composed of fatty material which accumulates and can become calcified. Atherosclerosis forms in muscular arteries and the aorta.

A thrombus is the name for a blood clot that forms on the inner lining of your blood vessels-most commonly the deep legs veins.

Reply 24

Arnaez3

Original post by Haddar

Wont let me upload file to big -_-

any chance you could email? sybrisk at gmail.com

Reply 25

Haddar

Original post by Arnaez3

any chance you could email? sybrisk at gmail.com

Sure just gimme the email couldnt find it :frown:

Reply 26

Loody Nagy

How do you define an isotonic, hypotonic and hypertonic solution?Also, 'protein carriers' and 'protein channels', what's the difference between them? and which one is assigned for facilitated diffusion and which one is for active transport?

Reply 27

ABeingOnEarth

Two days remaining...

Reply 28

perez_perez

Original post by Haddar

All you need for unit 2.

Holy **** this is gold. Do you have one for unit 1? if so can you send it to me through email at [email protected]

Thanks a lot

Reply 29

dsouza22neeson

Original post by Haddar

Sure just gimme the email couldnt find it :frown:

Hey would it be cool if you could email me your notes for unit 1 aswell?

Reply 30

Komol

Can anyone give me the ans of how molecule of mRNA is made during transcription (4 marks) thanks😊

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Reply 31

Kim_CP_1792

Original post by Haddar

All you need for unit 2.

do you have one for unit 1??

Reply 32

Komol

Describe the structure of starch (5 marks) need help in this question thanks...:-)

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Reply 33

Haddar

Original post by Kim_CP_1792

do you have one for unit 1??

Ya file too large to send tho -_-

Reply 34

Haddar

Original post by Komol

Describe the structure of starch (5 marks) need help in this question thanks...:-)

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Ok
-made up of glucose joined by glycosdic bonds via condensation reactions.
-2 molecules amylose and amylopectin
-amylose 1-4 glycosdic bonds and spirals(straight chain)
-amylopectin 1-6 and 1-4 glycosidic bonds( branches)

Out of the top of my head think it should get 5 tho :P

Reply 35

Komol

Original post by Haddar

Great it will help thanks a lot👍👍

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Reply 36

Komol

Need help in this question thanks :-)

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Reply 37

genevievelaw

Original post by Loody Nagy

I got a question...
The elastic fibres (in the aorta) stretch so that they can accommodate the greater volume of blood without being damaged. Between surges, these elastic fibres return to their original length, thus squeezing the blood and moving it in a continuous flow. This is known as elastic recoil.Alright, but does this elastic recoil raise or lower the blood pressure? If not, does it have any other role other than allowing the blood to move in a continuous flow?

Well, I think the elastic recoil helps to maintain its pressure. If you look at this graph (dotted line is arterial pressure), you can see that AP starts to fall, but then rises again before it continues to fall. I believe that this is due to the elastic recoil of the arterial walls :biggrin:

Reply 38

genevievelaw

Original post by Loody Nagy

The term protein carrier is generally used to refer to those that actively transport the substance/molecule, and protein channel for those that do not i.e. simply allow (facilitated) diffusion.