A level Biology: Post your doubts here!

[SohaibButt]

"In this question, he said to hemoglobin .. So the minim no of cell surface membranes is 5 ..
But, if he says the minimum number to plasma .. then it’s 4 ..
Because I think there is 2% that travels in the blood plasma ..
You’ll pass along questions that the minimum no for both co2 and o2 is 4 ! This is because some travels in blood plasma not inside the rbc (hemoglobin)
But in this question he specified .. that the minimum no to hemoglobin molecule is what he wants ..
This message is to clarify any doubts you’ll pass along when solving such questions ..
One membrane has 2 phospholipids .. Sometimes he refers to cell surface membrane by saying phospholipid bilayer ..
Not just phospholipids .."
I received this answer from a teacher

OXygen is always 5!

 

[innovative_1]

Btw is the answer 4 or 10?
I believe it's 10 becuase 5 times two.....is 10

It is 10!

 

[angryrider_56]

OXygen is always 5!

Oxygen is always 5 if they're asking about haemoglobin but it's 4 if they're asking about plasma (same with CO2)

 

[angryrider_56]

It is 10!

i agree

 

[angryrider_56]

Guys check the page @threesciencesforalevel on insta...
You'll be surprised at what you will find. Unfortunately, I just got to see it now :"(

 

[SohaibButt]

The calculations regarding tidal volume, vital capacity included in the syllabus?

 

[A*****]

The calculations regarding tidal volume, vital capacity included in the syllabus?

No

 

[angryrider_56]

Guys, is it A or C?

 

[kirzzz]

Thank you

Btw is the answer 4 or 10?
I believe it's 10 becuase 5 times two.....is 10

so the answer is 10?

 

[kirzzz]

View attachment 63795
Guys, is it A or C?

C (i guess)

 

[Hisham Khan]

View attachment 63795
Guys, is it A or C?

Answer is A.C is due to thrombosis

 

[Hisham Khan]

so the answer is 10?

Answer is 4.Just remember it needs to be 4 for oxygen everytime and 4 or 5 for co2 everytime

 

[kirzzz]

Answer is 4.Just remember it needs to be 4 for oxygen everytime and 4 or 5 for co2 everytime

oh aight. thank youu!

 

[innovative_1]

But it's A

Alvel

oh aight. thank youu!

It's 10

 

[ShahdNaasan]

Can someone please explain this ? (Answer is D and the examiner report says it is the ribosome )

 

[innovative_1]

Answer is 4.Just remember it needs to be 4 for oxygen everytime and 4 or 5 for co2 everytime

Hisham read the question carefully

 

[innovative_1]

Can someone please explain this ? (Answer is D and the examiner report says it is the ribosome )
View attachment 63796

Yeah ribosomes synthesis protein

 

[Hisham Khan]

Hisham read the question carefully

It's 4.Show me screenshot of marking scheme which says it's 10

 

[innovative_1]

It's 4.Show me screenshot of marking scheme which says it's 10

Oh c'mon hisham y don't u trust me?

 

[Hisham Khan]

Oh c'mon hisham y don't u trust me?

No because I have solved this question in the past paper and in marking scheme the answer is 4 for O2 innovative 'baby'