A level Biology: Post your doubts here!

[potatocorn12]

well are other varients doing worth it or not ?because i did 2017&march 2018 other varients today but they had similar questions,nothing new.

I started doing them in late march,silly me .I got 36/40 in latest paper.

 

[Hisham Khan]

well are other varients doing worth it or not ?because i did 2017&march 2018 other varients today but they had similar questions,nothing new.

They are worth it 100% lol.

 

[Hisham Khan]

CO2 Binds with amine group right?

 

[Hisham Khan]

btw how long does it take you to do one paper?

Hmm 35-40 minuites nowadays lol

 

[Hisham Khan]

Why is D wrong in 37.Doesen't antibiotic which is commonly used cause resistance?

 

[afiya3456]

View attachment 63894
Why is D wrong in 37.Doesen't antibiotic which is commonly used cause resistance?

antibiotic do not cause mutation of bacteria ,its mutagens that cause

 

[SohaibButt]

View attachment 63894
Why is D wrong in 37.Doesen't antibiotic which is commonly used cause resistance?

C

 

[mushu.jr]

9700_s13_qp11 no 1 pls help

 

[angryrider_56]

Can anyone tell me why 23 is C?

View attachment 63890 View attachment 63891

14 is A right?

 

[mushu.jr]

hi anyone with full explanations for march 2018

 

[SohaibButt]

Help

 

[AKA1001]

Which statements about water movement in plants are correct?
1 Water can pass through cellulose cell walls.
2 Water can pass through lignified cell walls.
3 Water cannot pass through suberin in cell walls.

A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

HELP PLZ!

 

[Hisham Khan]

View attachment 63894
Why is D wrong in 37

HelpView attachment 63898 View attachment 63898

A?

 

[AKA1001]

HelpView attachment 63898 View attachment 63898

Its C because the the amount of carbon dioxide produced or oxygen used does not depend on the surface area. However, the no of hormones detected are on cell surface membrane and thus its affected by surface area

 

[Hisham Khan]

Its C because the the amount of carbon dioxide produced or oxygen used does not depend on the surface area. However, the no of hormones detected are on cell surface membrane and thus its affected by surface area

True

 

[SohaibButt]

Its C because the the amount of carbon dioxide produced or oxygen used does not depend on the surface area. However, the no of hormones detected are on cell surface membrane and thus its affected by surface area

Sorrryyy it's C yes u right

 

[Hisham Khan]

Hormones are detected by the receptors on membrane of the cell. So the greater the cell surface area, the bigger the number of receptors that can detect hormones. The amount of gases used/produced in respiration are dependent on cell volume, as the bigger the cell the more consumption/production

 

[AKA1001]

Sorrryyy it's C yes u right

Oh lord phew! ok

 

[SohaibButt]

What? are you sure cuz I have done this question before and the correct answer was C

Yeah i said C

 

[Hisham Khan]

Which statements about water movement in plants are correct?
1 Water can pass through cellulose cell walls.
2 Water can pass through lignified cell walls.
3 Water cannot pass through suberin in cell walls.

A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

HELP PLZ!

A?