A level Biology: Post your doubts here!

[ZaqZainab]

Omg it did right? Even for chem. it did! They are kinda different, the papers this year.

The way the added Fill in the blanks after so long and they asked so less about plants i didnt like the balance of this paper probably losing alot of marks here. Idk about chem i am only giving paper 4 and 5 in chem.

 

[nehaoscar]

for variant 22 what did people say passes into the red blood cells?
Like via cell membrane
and the part before it too like why are they kept in the saline solution?

 

[Mahmood Magdy]

Saline Solution, same water potential therefore no net movement of water by osmosis. About the RBC, I wrote O2, simple diffusion through the phospholipid bilayers due to its lipid solubility. The fill in the banks were stupid,
1. habitat
2. population
3. producers
4. niche
5. ecosystem

 

[nehaoscar]

Saline Solution, same water potential therefore no net movement of water by osmosis. About the RBC, I wrote O2, simple diffusion through the phospholipid bilayers due to its lipid solubility. The fill in the banks were stupid,
1. habitat
2. population
3. producers
4. niche
5. ecosystem

I wrote Cl- instead of O2 ... you think it's correct? (they move in during bohr shift)

 

[Mahmood Magdy]

I wrote Cl- instead of O2 ... you think it's correct? (they move in during bohr shift)

They said 'component of blood plasma' therefore literally anything is correct provided you can explain the method, simple!

 

[Jeezan]

I wrote Cl- instead of O2 ... you think it's correct? (they move in during bohr shift)

if its Cl then it would be active transport
right ?

 

[Mahmood Magdy]

if its Cl then it would be active transport
right ?

I don't think so, what happens is that there is a specific protein that rapidly pushes HCO3- outside and Cl- inside. However, they never specified if it is active transport or facilitated diffusion.

 

[Amandaissocoollike]

Saline Solution, same water potential therefore no net movement of water by osmosis. About the RBC, I wrote O2, simple diffusion through the phospholipid bilayers due to its lipid solubility. The fill in the banks were stupid,
1. habitat
2. population
3. producers
4. niche
5. ecosystem

ahh no i think i accidentally wrote "net movement" instead of "no net movement". How many marks do you think I'll lose if I got the rest of the answer right? :/

 

[Jeezan]

I don't think so, what happens is that there is a specific protein that rapidly pushes HCO3- outside and Cl- inside. However, they never specified if it is active transport or facilitated diffusion.

I asked this with my teacher she said its correct

 

[Mahmood Magdy]

ahh no i think i accidentally wrote "net movement" instead of "no net movement". How many marks do you think I'll lose if I got the rest of the answer right? :/

If you wrote net movement in and out of the RBC then you won't lose any marks. But if you only specified one direction, like for ex net movement outside the RBC then maybe one mark.

 

[Mahmood Magdy]

I asked this with my teacher she said its correct

But Active Transport requires ATP, how will the RBC make them if it has no Mitochondria ?

 

[Midnight dream]

The way the added Fill in the blanks after so long and they asked so less about plants i didnt like the balance of this paper probably losing alot of marks here. Idk about chem i am only giving paper 4 and 5 in chem.

I thought the same thing..its was not at all well distributed.:/

 

[Midnight dream]

But Active Transport requires ATP, how will the RBC make them if it has no Mitochondria ?

Hey.. how did ur paper go?

 

[Jeezan]

But Active Transport requires ATP, how will the RBC make them if it has no Mitochondria ?

oh yes
but not sure :/

 

[nehaoscar]

But Active Transport requires ATP, how will the RBC make them if it has no Mitochondria ?

yeah... I said facilitated diffusion cause the cl- replace hco3-

 

[Mahmood Magdy]

Hey.. how did ur paper go?

My paper was fine, did lots of silly mistakes though. I did one blank wrong and believe it or not, I didn't add the Oxygen in the structure of B-glucose
Almost everyone in my batch had some trouble with the paper. No one really liked it.

 

[nehaoscar]

for the B-glucose, the 5th C out of the ring i put ch3O instead of ch2Oh... think they'll give a mark?

 

[Mahmood Magdy]

for the B-glucose, the 5th C out of the ring i put ch3O instead of ch2Oh... think they'll give a mark?

Yeah, as long as you have only one mistake(like me ) you will get a mark. SO STUPID! I'm srsly pissed of that stupid mistake.

 

[Midnight dream]

Yeah, as long as you have only one mistake(like me ) you will get a mark. SO STUPID! I'm srsly pissed of that stupid mistake.

-___- same here I too am pissed of ..!1 blank wrong.. AVN wala question bhi wrong..and the last question of graph was difficult:/

 

[Midnight dream]

I was pissed off at thw WHOLE paper! Most of the question were from Heart. i memorised the whole infection chapter since i was really weak but not a SINGLE question.:/ Not even from immunity.