A level Biology: Post your doubts here!

[potatocorn12]

btw in some papers,they have asked us about function of macrophages or of neutrophils,with same options.The both have the same answer acc to marking scheme.Does that mean they have the same function?

 

[Hisham Khan]

btw in some papers,they have asked us about function of macrophages or of neutrophils,with same options.The both have the same answer acc to marking scheme.Does that mean they have the same function?

neutrophils accumulate at site of infection.
macophages abtigen presentation and cytokine
Basophils histamine release

 

[Kanekii]

btw in some papers,they have asked us about function of macrophages or of neutrophils,with same options.The both have the same answer acc to marking scheme.Does that mean they have the same function?

Yes they are similar as they both are phagocytes

 

[potatocorn12]

neutrophils accumulate at site of infection.
macophages abtigen presentation and cytokine
Basophils histamine release

yeah but there was one question where even macrophages's function was to accumulate at site of infection,i got confused?

 

[Kanekii]

yeah but there was one question where even macrophages's function was to accumulate at site of infection,i got confused?

Yes both accumulate at site of infection to carry out phagocytosis

 

[Hisham Khan]

noice

 

[Kanekii]

Hisham can you repost link of hard bio mcqs i cant find it

 

[Daniel Avarro]

View attachment 63965 View attachment 63966

23 is C because Number 2. is wrong. The nucleotides are different. DNA has a deoxyribose sugar and RNA has a ribose sugar
18 is D. Because the rate is constant at one point, that there's a limiting factor(presence of channel protein).

 

[Hisham Khan]

I thought answer was 3 only

 

[Hisham Khan]

'I saw a question and they say growth of cell is not important for mitosis but somewhere else they said division of cells and somewhere else they said repair of tissues.I'm going to go mad help me.Why omg

 

[Hisham Khan]

Hisham can you repost link of hard bio mcqs i cant find it

https://www.xtremepapers.com/commun...est-questions-compiled-a-level-version.36302/

 

[Tajrina Promela]

 

[Daniel Avarro]

View attachment 63973

C?

 

[SohaibButt]

This thread is nothing without hisham

 

[SohaibButt]

I'm feeling so alone over here now

 

[A*****]

How is 1 correct?

 

[A*****]

Is it D??

 

[A*****]

How is C wrong?

 

[innovative_1]

View attachment 63978
Is it D??

Yes

 

[innovative_1]

View attachment 63979
How is C wrong?

Pressure in atrium can never rise above ventricle!