biology paper 1 doubts

[ijjukittu]

I'm not sure about it! What did you choose?

the answer was A

 

[TCHS]

What was the option A??

 

[Alice123]

I chose B which was the entry or something of water-soluble molecules, glucose & o2
:/

what was option A?

 

[TCHS]

what was option A?

That's what I'm asking too

 

[babycry]

are u sure about that?

i chose the option where it said it bind to water to stabilise the membrane. this function is carried out by the glycolipids and not the phospholipids. thats why they borught 2 options we were not familiar with

 

[TCHS]

i chose the option where it said it bind to water to stabilise the membrane. this function is carried out by the glycolipids and not the phospholipids. thats why they borught 2 options we were not familiar with

That's true but isn't the entry & exit of water-soluble molecules, O2 & glucose done by protein channels & stuff? They were trying to confuse us by putting these 2 options :/

 

[babycry]

no water is the only ionic substance that can diffuse thru, and co2 + o2 pass thru by diffusion, ive seen that before in past papers and ive learnt that as well

 

[TCHS]

no water is the only ionic substance that can diffuse thru, and co2 + o2 pass thru by diffusion, ive seen that before in past papers and ive learnt that as well

Water can pass through but it doesn't. It chooses to go through water channels. & glucose goes through facilitated diffusion. Right?

 

[xtremeforums]

For the phospholipid question:
i chose D
forms H bonds with water to stabilise the membrane...

 

[TCHS]

Oh well :/
What other questions guys?

 

[babycry]

yea i chose d as well, u see water channels are beyond the scope of our syllabus (its my first time hearing bout them). i quote from a level bio textbook: "the respiratory gases, 02 and co2, cross membranes by diffusion. they are uncharged and non-polar, and so can cross thru the phospholipid bilayer directly between the phospholipid molecules"

 

[TCHS]

yea i chose d as well, u see water channels are beyond the scope of our syllabus (its my first time hearing bout them). i quote from a level bio textbook: "the respiratory gases, 02 and co2, cross membranes by diffusion. they are uncharged and non-polar, and so can cross thru the phospholipid bilayer directly between the phospholipid molecules"

I see
One more mark less :/
What questions did you find confusing??

 

[ijjukittu]

yea i chose d as well, u see water channels are beyond the scope of our syllabus (its my first time hearing bout them). i quote from a level bio textbook: "the respiratory gases, 02 and co2, cross membranes by diffusion. they are uncharged and non-polar, and so can cross thru the phospholipid bilayer directly between the phospholipid molecules"

But ! The question was about which one of the following is 'not' a function of phospholipid?

 

[babycry]

how was the option phrased exactly? i forgot anyways nothing we can change

 

[TCHS]

What did you write for the question about enzymes & metabolism? (forgot the wording of the question)

 

[Taci12]

But ! The question was about which one of the following is 'not' a function of phospholipid?

Glycoproteins and glycolipids bind with water molecules to stabilise the membrane not phospholipids. Thus answer is D

 

[Taci12]

What about the ecology question? Question 39? Which organism would increase in number if X is removed?

 

[ijjukittu]

Glycoproteins and glycolipids bind with water molecules to stabilise the membrane not phospholipids. Thus answer is D

Yeah i know that!!! But they are a part of phospholipids! So! i wrote A.......

 

[TCHS]

What about the ecology question? Question 39? Which organism would increase in number if X is removed?

C?

 

[ijjukittu]

What about the ecology question? Question 39? Which organism would increase in number if X is removed?

C