A level Biology: Post your doubts here!

[Mayisha M]

btw is tri glyceride hydrophillic?
and is it soluble in alcohol :/?

No, triglycerides are not hydrophilic because the Carbon-Hydrogen bonds are non-polar.
They're hydrophobic.
Phospholipids are hydrophilic. They have polar phosphate groups.
Hope that helps

 

[daredevil]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w11_qp_53.pdf

somebody plz solve Q2 from this and tell me how they have calculated the expected ratios...!!

 

[kitkat <3 :P]

No, triglycerides are not hydrophilic because the Carbon-Hydrogen bonds are non-polar.
They're hydrophobic.
Phospholipids are hydrophilic. They have polar phosphate groups.
Hope that helps

thank u got it

 

[mm89mm]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s13_qp_12.pdf
Q14

It is C, because the other ones all have 1 decimal place in the mean while in the recordings they had 0 decimal places

 

[ZaqZainab]

It is C, because the other ones all have 1 decimal place in the mean while in the recordings they had 0 decimal places

yeah i got that someone answered me already Appreciate the response though

 

[EmiraS]

btw is tri glyceride hydrophillic?
and is it soluble in alcohol :/?

soluble in alcohol, yes.

 

[DeViL gURl B)]

Guys.. If anyone made any useful notes related to tomorrow's paper ... Please share
Thank you

 

[EmiraS]

Guys.. If anyone made any useful notes related to tomorrow's paper ... Please share
Thank you

i think the best thing to do is to do past papers, they have a nasty habit of repeating questions (guess theyre starting to lack inspiration haha)

 

[DeViL gURl B)]

i think the best thing to do is to do past papers, they have a nasty habit of repeating questions (guess theyre starting to lack inspiration haha)

Well .. Doin least papers since mornin
Btw true
But u know ppl make notes from the past papers as well .. So smthn like that

 

[princeali97]

What is the logic behind this question?.--->Q14 http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_s13_qp_12.pdf

 

[DeViL gURl B)]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w10_qp_13.pdf

Question 27 ?
Please explain ... And why not A is the answer?

 

[DeViL gURl B)]

Is

What is the logic behind this question?.--->Q14 http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s13_qp_12.pdf

it C?

 

[princeali97]

Is

it C?

Yes whyy?

 

[anamta]

http://papers.xtremepapers.com/CIE/...and AS Level/Biology (9700)/9700_w07_qp_1.pdf
question 39??? anyone? :/

 

[princeali97]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w07_qp_1.pdf
question 39??? anyone? :/

Common sense based question,no logic.When theres a volcanic eruption,large amount of dust is present in the air,so think of it will u be able to survive in it? NO.Similarly other large living organisms like us cant.So plants,primary consumers and secondary consumers will decrease they will die.So it will be B.

 

[Karim Nabil]

Yes whyy?

Take off anomalous results and calculate average, then try eliminating wrong ones and observe the remaining options.

 

[Karim Nabil]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w10_qp_13.pdf

Question 27 ?
Please explain ... And why not A is the answer?

Because at the beginning of a reaction, there shouldn't be any free active sites because many substrate molecules are present, instead more E-S complex forming so answer is B

 

[DeViL gURl B)]

Yes whyy?

Cuz whenever they ask for the mean it has to be a whole number... As done in the other past papers as well ..
Btw told by https://www.xtremepapers.com/community/members/♣♠-magnanimous-♣♠.98882/

 

[DeViL gURl B)]

Take off anomalous results and calculate average, then try eliminating wrong ones and observe the remaining options.

That's quite complicated

 

[joanna omar]

Does methylene blue stain the DNA/chromosomes if mitosis is to be observed under a microscope?

Yeah ..I guess but better ethidum bromide