A level Biology: Post your doubts here!

[Tasneeem]

ppl ! ..... Is paper 2 bio v22 easier than v21 or harder? because its the first time for me to enter october november sessions.
Are all of you gonna take bio v22 this wednesday?

 

[Bba321]

ppl ! ..... Is paper 2 bio v22 easier than v21 or harder? because its the first time for me to enter october november sessions.
Are all of you gonna take bio v22 this wednesday?

Yes. I am.Not sure about the difficulty level!

 

[RoOkaYya G]

ppl ! ..... Is paper 2 bio v22 easier than v21 or harder? because its the first time for me to enter october november sessions.
Are all of you gonna take bio v22 this wednesday?

ppl say 22 is easier. but lets see..

 

[Tasneeem]

good luck

 

[Saad Amjad.]

I hope questions from infectious diseases dont come in 2moro's p22 exam..very confusing :/

 

[Bba321]

Good luck all

 

[forsaken]

do we have to study microglia and astrocytes in nervous system

 

[Shada Mohammed]

Guys I am really confused does the follicle starts to be formed when the oogonia has finished dividing to be primary oocyte or when it is secondary oocyte.

 

[funky brat]

Can anybody explain why is the answer B and not C? If the moelcule was 100% saturated it would contain 8 oxygen atoms, since it is slightly less should not it contain 6 oxygen atoms?

 

[forsaken]

Can anybody explain why is the answer B and not C? If the moelcule was 100% saturated it would contain 8 oxygen atoms, since it is slightly less should not it contain 6 oxygen atoms?

the question says that how many molecules will be attached , 6 and 8 is wrong because 12 and 16 atoms can not attach at the site with 8 atoms max space.now 2 molecules means two haeme groups will be left unused so it leave you with b. correct me if i am wrong

 

[huh]

Can anybody explain why is the answer B and not C? If the moelcule was 100% saturated it would contain 8 oxygen atoms, since it is slightly less should not it contain 6 oxygen atoms?

I would think of the reaction:-

Hb + 402 = Hb08

Since it is molecules, should be B.

 

[funky brat]

the question says that how many molecules will be attached , 6 and 8 is wrong because 12 and 16 atoms can not attach at the site with 8 atoms max space.now 2 molecules means two haeme groups will be left unused so it leave you with b. correct me if i am wrong

I would think of the reaction:-

Hb + 402 = Hb08

Since it is molecules, should be B.

Umm thanks both of you. I realised I was mistaking molecules for atoms.

 

[Saad Amjad.]

need A2 notes for 1)selection and evolution..2)biodiversity and conservation...please help..my p4 exam is next week. :/

 

[Saad Amjad.]

need A2 notes for 1)selection and evolution..2)biodiversity and conservation...please help..my p4 exam is next week. :/

 

[forsaken]

need A2 notes for 1)selection and evolution..2)biodiversity and conservation...please help..my p4 exam is next week. :/

i got it from somewhere hope this helps

 

[Saad Amjad.]

i got it from somewhere hope this helps

oh thanks a lot..btw any notes on biodiversity??..its the most confusing to me

 

[ShreeyaBeatz]

Guys please tell me why active transport doesnt get affected when membrane fluidity changes ??

 

[♣♠ Magnanimous ♣♠]

Here you go ---> http://www.slideshare.net/arzoosahni/evs-biodiversity-notes

oh thanks a lot..btw any notes on biodiversity??..its the most confusing to me

 

[♣♠ Magnanimous ♣♠]

Guys please tell me why active transport doesnt get affected when membrane fluidity changes ??

First of all Active Transport means transfer of ions from it's LOWER conc to HIGHER conc AGAINSt the conc gradient. And fluidity of membrane means membrane fluidity refers to the viscosity of the lipid bilayer of a cell membrane or a synthetic lipid membrane
Fluidity of membrane helps in transport of molecules such as water and gaseous particles i.e. diffusion. So if fluidity is affected than diffusion of particles is affected coz they transport from Higher water conc to Lower water conc whereas active transport is opp and also it needs ATP to take place.
So, Active transport is not at all affected by fluidity of membrane.

Sorry for the late reply. Yesterday I saw your ques and I was knowing the answer but wasn't sure so today I asked about this to my Bio teacher and I wrote this answer.
I hope you got it.

 

[ShreeyaBeatz]

First of all Active Transport means transfer of ions from it's LOWER conc to HIGHER conc AGAINSt the conc gradient. And fluidity of membrane means membrane fluidity refers to the viscosity of the lipid bilayer of a cell membrane or a synthetic lipid membrane
Fluidity of membrane helps in transport of molecules such as water and gaseous particles i.e. diffusion. So if fluidity is affected than diffusion of particles is affected coz they transport from Higher water conc to Lower water conc whereas active transport is opp and also it needs ATP to take place.
So, Active transport is not at all affected by fluidity of membrane.

Sorry for the late reply. Yesterday I saw your ques and I was knowing the answer but wasn't sure so today I asked about this to my Bio teacher and I wrote this answer.
I hope you got it.

Thank you so much