A level Biology: Post your doubts here!

[SohaibButt]

the answer for question 13 is B (i guess) because look;
A - is partially true, the cell surface membrane and the membranes of the organelles allow intracellular transport but they also allow extracellular transport. because the term "extracellular transport" is not stated, im guessing that A is only partially true.
B - seems the correct option because the carbohydrate chains that are present on glycoproteins form hydrogen bonds with water molecules and help to stabilise the membrane structure.
C - not really sure but why would enzymes attach to the membranes of organelles?
D - lyzomes themselves have a membrane to prevent their contents from coming into contact with other organelles so why would the membranes protect the organelles?

No u were right it was C

 

[kirzzz]

Y

Yup it's A

i think its because active transport requires energy and also takes place via proteins in the cell surface membrane therefore even if temperature does change, only the phospholipids are affected.

 

[kirzzz]

No u were right it was C

wait im confused now

 

[Hisham Khan]

 

[SohaibButt]

wait im confused now

It's alright take time

 

[Hisham Khan]

*Receptors* *Cough*Cough*

 

[Hisham Khan]

Membranes within cells don't form hydrogen bonds

 

[SohaibButt]

Membranes within cells don't form hydrogen bonds

A can be right as well?

 

[kirzzz]

Membranes within cells don't form hydrogen bonds

what really

 

[kirzzz]

A can be right as well?

omg im sorry

 

[Hisham Khan]

A can be right as well?

No because cell surface membrane allow INTERcellular not INTRAcelluar transport

 

[Hisham Khan]

omg im sorry

Why're you sorry haha

 

[SohaibButt]

No because cell surface membrane allow INTERcellular not INTRAcelluar transport

Both r different things?

 

[Hisham Khan]

Yes. Intracellular transport is the movement of vesicles and substances within the cell. ... This method of transport is often confused with intercellular transport, which deals solely with the movement of cargo between cells not the net movement within a cell.

 

[SohaibButt]

Yes. Intracellular transport is the movement of vesicles and substances within the cell. ... This method of transport is often confused with intercellular transport, which deals solely with the movement of cargo between cells not the net movement within a cell.

How does hormones transported?

 

[kirzzz]

Yes. Intracellular transport is the movement of vesicles and substances within the cell. ... This method of transport is often confused with intercellular transport, which deals solely with the movement of cargo between cells not the net movement within a cell.

yeah but the question says intracellular transport right

 

[kirzzz]

In q17 why 2 is wrong? The rate of active transport doesn't increased if higher conc inside the vacuole?

im sorry but i dont really know the answer to that question. i need to revise transport in plants ☺

 

[Hisham Khan]

yeah but the question says intracellular transport right

It says intra that's why it is wrong

 

[SohaibButt]

im sorry but i dont really know the answer to that question. i need to revise transport in plants ☺

Don't worry it's alright

 

[Hisham Khan]

How does hormones transported?

Intercellularly