A level Biology: Post your doubts here!

[nehaoscar]

 

[Sadi66]

SOMEONE PLEASE HELP ME IN THESE!!!!!!!!!!!!!!!
MAY 2013 P11
Q15: WHY OPTION A WRONG'
Q31
Q39 THE NITROGEN FIXING REQUIRE ANAEROBIC CONDITION FOR N FIXING?
________________________________
MAY 2013 P12:
Q31 EXPLAIN ALL OPTIONS PLS
Q29
Q32
Q35 : PLS EXPLAIN THIS IN DETAIL LIKE WHATS INFLAMMATION AND SCARRED ?
Q40
______________________________
MAY 2013 P13:
Q10; WHY D NOT
Q12
Q15
Q39
________________________
OCT 2013 P12
Q29
Q35
Q39 WHATS INORGANIC NITROGEN ?
Q40
_________________________
OCT 2013 P13;
Q22 WHY C WRONG
_________________________
JUNE 2008 Q27?
)))))))))))))))))))))))))))))))
june 2005 q32 why not D?

 

[princess Anu]

D. The graph shows percentage of smokers every year. However, every year population is also increasing. So if at beginning around 80% are smokers then later 32% are smokers it might seem okay to conclude that the number of men who were smokers decreased by 60%, but this cannot be true, since population has changed, option D actually states "number of men" so it cannot be true.

I donot get it

 

[My Name]

My Name
Also,
I think the phagocytic vacuole formation should be before digestion by lysosomal enzymes...

Yes, right thank you!
( I accidentally copied the wrong option Very sorry )

My Name
Your immunity notes say:


You mixed up the passive with active I think. Replace all active with passive and all active with passive and it should be correct

Ty
its supposed to be like this:

Active natural- reaction in the body to infection

Active artificial- reaction following vaccination

Passive natural- by antibodies passing through placenta

Passive artificial- following injection of antibodies in serum

 

[My Name]

IMMUNITY

There were two mistakes in these

-The correct answer would be like this
Active natural- reaction in the body to infection

Active artificial- reaction following vaccination

Passive natural- by antibodies passing through placenta

Passive artificial- following injection of antibodies in serum

-the action of a phagocyte when a pathogen is encountered is supposed to be like this:
endocytosis → phagocytic vacuole formation → digestion by lysosome enzymes → exocytosis

THIS POST HAS BEEN EDITED PLEASE CHECK
and I'm very sorry about those mistakes

 

[nehaoscar]

Aren't there only 3
1. RBC
2. capillary membrane
3. alveoli membrane

But then its D :O how??

 

[hizirofaki]

View attachment 53196

the ans is d ???

 

[My Name]

INFECTIOUS DISEASES
Which disease is not likely to be passed directly from parent to child?
The answer to this is Malaria!

POST EDITED Please check and sorry again!

 

[qwertypoiu]

THIS POST HAS BEEN EDITED PLEASE CHECK
and I'm very sorry about those mistakes

Don't be sorry your notes are helpful

 

[qwertypoiu]

What's the difference between endocytosis and phagocytosis?
qwertypoiu

Endocytosis is bringing material into cell.
If this is done by a phagocyte, it's known as phagocytosis.

 

[My Name]

Don't be sorry your notes are helpful

I'm glad they were helpful but I made mistakes I should have re checked everything but I didn't.
Thank you again!

 

[My Name]

Endocytosis is bringing material into cell.
If this is done by a phagocyte, it's known as phagocytosis.

And also we can say that a part of phagocytosis is endocytosis right?

 

[Mimick]

SOMEONE PLEASE HELP ME IN THESE!!!!!!!!!!!!!!!
MAY 2013 P11
Q15: WHY OPTION A WRONG'
Q31
Q39 THE NITROGEN FIXING REQUIRE ANAEROBIC CONDITION FOR N FIXING?
________________________________
MAY 2013 P12:
Q31 EXPLAIN ALL OPTIONS PLS
Q29
Q32
Q35 : PLS EXPLAIN THIS IN DETAIL LIKE WHATS INFLAMMATION AND SCARRED ?
Q40
______________________________
MAY 2013 P13:
Q10; WHY D NOT
Q12
Q15
Q39
________________________
OCT 2013 P12
Q29
Q35
Q39 WHATS INORGANIC NITROGEN ?
Q40
_________________________
OCT 2013 P13;
Q22 WHY C WRONG
_________________________
JUNE 2008 Q27?
)))))))))))))))))))))))))))))))
june 2005 q32 why not D?

give me some time i will check and tell u

 

[nehaoscar]

the ans is d ???

Yep How!?

 

[nehaoscar]

Endocytosis is bringing material into cell.
If this is done by a phagocyte, it's known as phagocytosis.

Then why is this A?

 

[nehaoscar]

 

[My Name]

-the action of a phagocyte when a pathogen is encountered is supposed to be like this:
endocytosis → phagocytic vacuole formation → digestion by lysosome enzymes → exocytosis

I added the correct answer in my P1 notes.

View attachment 53208
Then why is this A?

 

[Lola_sweet]

View attachment 53211

whts the answer to this?

 

[nehaoscar]

Why is it B
I know it's passive but the body is infected by a snake bite so shouldn't it be natural ?

 

[nehaoscar]

whts the answer to this?

D ... but i don't know why :S