A level Biology: Post your doubts here!

[A*****]

Insha'allah we will ace in it

Insha Allah

 

[Hisham Khan]

hey btw what was charateristic features of phelom tube one.
Ws it no lignified walls and ??

 

[A*****]

What do you guys think would be the overall threshold? For S4 (those with p34), will it be higher or lower than last year? 95/130 was the threshold last year.

Paper was hard so lower I think

 

[A*****]

hey btw what was charateristic features of phelom tube one.
Ws it no lignified walls and ??

And lower wp

 

[Hisham Khan]

And lower wp

yasss

 

[Hisham Khan]

And lower wp

Pls help me with this chem q plsss
as temp increase,
1:the maximum of boltzman curve is displaced to the right
2:the proportion of molecules with energy above any given value increases
3:the proportion of molecules with any given energy increases

why is 3 wrong???? and what does 2 mean

 

[AyushB]

2?

 

[Hisham Khan]

4

 

[Hisham Khan]

View attachment 63996
2?

2 on each side

 

[IwanttopassAlevel]

A scientist carried out an experiment to separate the organelles in an animal cell by mass.
The scientist mixed the cells with a buffer solution which had the same water potential as the
cells. He then broke the cells open with a blender to release the organelles.
The extracted mixture was filtered and then spun in a centrifuge at a speed that separates the
heaviest organelle. This organelle sank to the bottom, forming a solid pellet, 1.
solid pellet
liquid above
pellet
The liquid above pellet 1 was poured into a clean centrifuge tube and spun in the centrifuge at a
higher speed to separate the next heaviest organelle. This organelle sank to the bottom, forming
a solid pellet, 2.
He repeated this procedure twice more to obtain pellet 3 and pellet 4, each containing a single
organelle.
What is the function of the organelle extracted in pellet 4?



please help
s16 p12

 

[Hisham Khan]

A scientist carried out an experiment to separate the organelles in an animal cell by mass.
The scientist mixed the cells with a buffer solution which had the same water potential as the
cells. He then broke the cells open with a blender to release the organelles.
The extracted mixture was filtered and then spun in a centrifuge at a speed that separates the
heaviest organelle. This organelle sank to the bottom, forming a solid pellet, 1.
solid pellet
liquid above
pellet
The liquid above pellet 1 was poured into a clean centrifuge tube and spun in the centrifuge at a
higher speed to separate the next heaviest organelle. This organelle sank to the bottom, forming
a solid pellet, 2.
He repeated this procedure twice more to obtain pellet 3 and pellet 4, each containing a single
organelle.
What is the function of the organelle extracted in pellet 4?



please help
s16 p12

produce atp.

 

[angryrider_56]

View attachment 63997
2 on each side

u sure its 4? :"(

 

[A*****]

Pls help me with this chem q plsss
as temp increase,
1:the maximum of boltzman curve is displaced to the right
2:the proportion of molecules with energy above any given value increases
3:the proportion of molecules with any given energy increases

why is 3 wrong???? and what does 2 mean

Why do 2 and 3 sound the same?

 

[Hisham Khan]

u sure its 4? :"(

one for light one for heavy and same for another side so i fear yes

 

[Hisham Khan]

Why do 2 and 3 sound the same?

same thing I'm asking

 

[A*****]

same thing I'm asking

Now I think that 2 is correct
The WHOLE curve shifts to the right. Energy above any value is the area under the curve to the right of that value...so if u shade areas of different values of energy, you will find that the area will be higher for the curve of higher temp(shifted to the right that's why)
As far as 3 is concerned, the proportion of molecules having a PARTICULAR VALUE of energy is the corresponding value of y axis so you can see from the above graph that at B, the proportion of molecules with B energy is higher for the higher temp but if u look at A, the proportion of molecules with A energy is higher for the lower temp...therefore, 3 is only correct for the region AFTER the 2 lines intersect
Hope this is helpful

 

[Kanekii]

Guys what option did you chose for chemical X funny how it reminded of powerppuff girls xD
And what about the left atrioventricular valve one and how was your paper hope it went good

 

[Hisham Khan]

X

Guys what option did you chose for chemical X funny how it reminded of powerppuff girls xD
And what about the left atrioventricular valve one and how was your paper hope it went good

one was phosphate..atria was higher pressure in atrium one I guess.
What did you write about sucrose and water transport.Did they mess up the wording or what lol???

 

[Kanekii]

X

one was phosphate..atria was higher pressure in atrium one I guess.
What did you write about sucrose and water transport.Did they mess up the wording or what lol???

Oh then i wrote 5 carbon sugar :/
I choose the one where aorta had less blood flow guess that was wrong. Dammit i screwed up biomcqs
It was C as phloem transports dissolved solution of sucrose

 

[A*****]

Oh then i wrote 5 carbon sugar

Shouldn't it be sugar bqz it was XNA instead of DNA/RNA and D and R stand for sugar....plus there wo no other evidence of it being phosphate