A level Biology: Post your doubts here!

[Hisham Khan]

No news on Bio 34? My teacher sent me "9700_s09_qp_31 (question 1)" and "9700_s14_qp_33 (Question 2)" and said the exam is gonna come very similar to these two questions......But I wanna make sure by seeing a prediction paper or a guess paper or something...Please, if anyone gets anything, don't hesitate to send here. (i want to guarantee Bio as I fucked up maths already) and thank you.

Your teacher giving you the hint is already big enough or a prediction for questions by itself.I suggest you do read both of them throughly and you'll be just fine

 

[Hisham Khan]

Between I suggest you go throughly through both of these videos.Best videos to understand topic that is 90% expected to come.

Check difference btw histogram and barchart and how to draw each of them in detail!.
Also check feb march 2018 papers because thee new type of microscope questions are really hard!.

Also make sure you do know how to perform benedicttest for both reducing and non reducing, emulsion test,iodine test,semi quantitative test,protein test by heart,even though you might be given the steps.

And also try to learn 3 improvements and 1 error as well for these test!!!.

Good luck

 

[theweeknd]

No news on Bio 34? My teacher sent me "9700_s09_qp_31 (question 1)" and "9700_s14_qp_33 (Question 2)" and said the exam is gonna come very similar to these two questions......But I wanna make sure by seeing a prediction paper or a guess paper or something...Please, if anyone gets anything, don't hesitate to send here. (i want to guarantee Bio as I fucked up maths already) and thank you.

i think its based on yeast slides this time i guess

 

[ShahdNaasan]

Hello
Could anyone please help me with this question? Why is 1 wrong ?

 

[ShahdNaasan]

I also dont understand this one. Can someone explain ?

 

[A*****]

Hello
Could anyone please help me with this question? Why is 1 wrong ?
View attachment 63682

Although they FUNCTION like proteins but they are RNA molecules, so their structure will not be similar to proteins
Ionic bonds can not exist as there is no charged group in the RNA molecule

 

[A*****]

I also dont understand this one. Can someone explain ?
View attachment 63683

Cells in Q are more turgid so they are like more flattened

 

[Hisham Khan]

Cells in Q are more turgid so they are like more flattened

I have 4 or 5 questions.Can I ask you? lol

 

[ShahdNaasan]

Cells in Q are more turgid so they are like more flattened

How can you tell that they are more turgid if only the leaf shape is shown ?

 

[Hisham Khan]

How can you tell that they are more turgid if only the leaf shape is shown ?

Look first see which options are incorrect.
They are cell of same xerophytic plant right?.
So now 4th option is water potentiol is 0 in cell Q which is not possible because it's shape is diffeen and flattened.
that leaves option A and B.
Cells cannot be LESS TURGID when they are PLAMOLYSED. Get it?.
And you can sort of confirm it from the shape as well.
Thus option B

 

[A*****]

I have 4 or 5 questions.Can I ask you? lol

Yeah sure

 

[A*****]

How can you tell that they are more turgid if only the leaf shape is shown ?

The shape actually tells us about them being turgid or plasmolysed...consider a wilted leaf. That is plasmolysed and we can observe that it has a bent type of shape. On the other hand if we have a turgid leaf, it would have an inflated shape

 

[Hisham Khan]

The shape actually tells us about them being turgid or plasmolysed...consider a wilted leaf. That is plasmolysed and we can observe that it has a bent type of shape. On the other hand if we have a turgid leaf, it would have an inflated shape

It cannot be less turgid when it is already plasmolysed is the hint I guess

 

[Hisham Khan]

The shape actually tells us about them being turgid or plasmolysed...consider a wilted leaf. That is plasmolysed and we can observe that it has a bent type of shape. On the other hand if we have a turgid leaf, it would have an inflated shape

I have posted them in my forum
As level Biology paper 1 Help!!! In help idea and suggestions.Pls check them

 

[ShahdNaasan]

The shape actually tells us about them being turgid or plasmolysed...consider a wilted leaf. That is plasmolysed and we can observe that it has a bent type of shape. On the other hand if we have a turgid leaf, it would have an inflated shape

Thank you

 

[Hisham Khan]

Btw this question is difficult as well

 

[Kanekii]

Did onion epidermis or yeast come in P33?
If not then what experiment was it?

 

[ShahdNaasan]

Can anyone explain this ?

 

[Hisham Khan]

Can anyone explain this ?
View attachment 63696

Each time he repeats the procedure,he gets a 'new' pellet with a 'single' organelle,indicating previous organelles were digested.

 

[ShahdNaasan]

Each time he repeats the procedure,he gets a 'new' pellet with a 'single' organelle,indicating previous organelles were digested.

How were they digested ? They sank to the bottom after centrifuging