A level Biology: Post your doubts here!

[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?

 

[SohaibButt]

A?

Yes A is right

 

[AKA1001]

A?

Yea it's A but what about C?

 

[SohaibButt]

Yea it's A but what about C?

Xylem is made up of lignin so water can pass through it

 

[Kanekii]

 

[Hisham Khan]

View attachment 63899View attachment 63902 View attachment 63903 View attachment 63900

Q1:B
Q13:A

 

[Hisham Khan]

Q10

 

[Hisham Khan]

Q10 D lol

 

[Kanekii]

Could you explain 10 and 13?
Seems like you have done this paper before

 

[Hisham Khan]

Every amino acid binds 1 binds with the 3rd amino acid in 1,3 pair so if you count from 35 till 52 in 3's youll find out D

 

[Hisham Khan]

Non cometitve inhibitor may bind to site other then active site and change shape of active site of enzyme an preventing product to form even tho substrate is in active site .allosteric site is place on an enzyme where a molecule that is not a substrate may bind which is basically inhibitor

 

[SohaibButt]

10 D

 

[SohaibButt]

How to do this?

 

[Hisham Khan]

How to do this?

Find out how many micrometer in 1cm.Then find out the answer by mathematics as diameter is given

 

[AKA1001]

Xylem is made up of lignin so water can pass through it

Isn't lignin water proof?

 

[SohaibButt]

Isn't lignin water proof?

Yes it is waterproof but here they r saying about structure as water can move through xylem by adhesion tho it is made up of lignin

 

[SohaibButt]

Find out how many micrometer in 1cm.Then find out the answer by mathematics as diameter is given

I'm not getting answer tbh...

 

[SohaibButt]

Thank god I didn't took maths!

 

[Hisham Khan]

Thank god I didn't took maths!

Watch first 33 seconds.This is me

 

[Kanekii]

Non cometitve inhibitor may bind to site other then active site and change shape of active site of enzyme an preventing product to form even tho substrate is in active site .allosteric site is place on an enzyme where a molecule that is not a substrate may bind which is basically inhibitor

Thanks alott but what about the substrate binding to the active site even though non competitive inhibitor alters active site so substrate cannot bind.