A level Biology: Post your doubts here!

[A*****]

It's kind of approval from school that he can secure more than 65% in cie so he/she may appear for the entry test

So it would be only necessary for those entry tests happening before the results

 

[A*****]

See in option 2 apoplastic pathway is valid but y not in previous question?

The only reason I can think of about the statement in previous question being wrong is that water and ions can move laterally as well from vessel to vessel via pits, which is not an apoplastic pathway maybe...so the statement that the ions take an apoplastic pathway 'only' will be wrong

 

[A*****]

In the mark scheme, the answer for this is D but I strongly think that it should be A and I think that in some previous paper, it has been marked as A
How can the es complexes' concentration be max at time zero? Initially it should be zero, then rise to max and then decrease

 

[innovative_1]

In the mark scheme, the answer for this is D but I strongly think that it should be A and I think that in some previous paper, it has been marked as A
How can the es complexes' concentration be max at time zero? Initially it should be zero, then rise to max and then decrease

Yeah A is 100% correct what's wrong with the bio?? I did similar questions n always it's A B is for the products C is for the enzyme but what is for D?

 

[innovative_1]

In the mark scheme, the answer for this is D but I strongly think that it should be A and I think that in some previous paper, it has been marked as A
How can the es complexes' concentration be max at time zero? Initially it should be zero, then rise to max and then decrease

Have u check the er?

 

[innovative_1]

In the mark scheme, the answer for this is D but I strongly think that it should be A and I think that in some previous paper, it has been marked as A
How can the es complexes' concentration be max at time zero? Initially it should be zero, then rise to max and then decrease

Ig D is right bcoz here substrate used in excess mean within no time es complexes will formed whereas in A it do takes time

 

[A*****]

Ig D is right bcoz here substrate used in excess mean within no time es complexes will formed whereas in A it do takes time

No matter how much the substrate is in exess but still it will take SOME time to form the es complexes and upto some time the concentration will increase and then decrease

 

[A*****]

Bio is literally rediculous...I mean it has lammmeeeee logics, in some questions they apply a particular logic and in the other they apply some other

 

[Hisham Khan]

See in option 2 apoplastic pathway is valid but y not in previous question?

If you read the previous question carefully,you'll notice that they say they pass through xylem by Apoplastic pathway ONLY.

 

[A*****]

If you read the previous question carefully,you'll notice that they say they pass through xylem by Apoplastic pathway ONLY.

So what's the reason of it being wrong? The point which I said is correct?

 

[Hisham Khan]

I didn't see the previous statements you people made....

 

[A*****]

The only reason I can think of about the statement in previous question being wrong is that water and ions can move laterally as well from vessel to vessel via pits, which is not an apoplastic pathway maybe...so the statement that the ions take an apoplastic pathway 'only' will be wrong

This Hisham Khan

 

[Hisham Khan]

And D is pretty obvious for enzyme question as all enzyme substrate complex will change intro product.No rocket science I think.And they are telling you how conc of enzyme substrate complex changes over time not how it formed over time .

 

[A*****]

And D is pretty obvious for enzyme question as all enzyme substrate complex will change intro product.No rocket science I think.And they are telling you how conc of enzyme substrate complex changes over time not how it formed over time .

But it is pretty obvious that at time zero there would be no es complexes... From where on earth have they come from when there was no enzyme?

 

[Hisham Khan]

This Hisham Khan

Yeah that's right ..... Sorry I missed it or something ...

 

[innovative_1]

And D is pretty obvious for enzyme question as all enzyme substrate complex will change intro product.No rocket science I think.And they are telling you how conc of enzyme substrate complex changes over time not how it formed over time .

Ok if u think D is correct what abt A?

 

[A*****]

And D is pretty obvious for enzyme question as all enzyme substrate complex will change intro product.No rocket science I think.And they are telling you how conc of enzyme substrate complex changes over time not how it formed over time .

And one more thing...first es complexes will form and then they will break...this will happen with tym

 

[Hisham Khan]

But it is pretty obvious that at time zero there would be no es complexes... From where on earth have they come from when there was no enzyme?

Ok if u think D is correct what abt A?

Look A isin't correct because if you look carefully,you will see that the graph doesent reach 0.As conc of substrate is LITTLE in excess and enzyme remain unchanged no matter how many complexes form,there will be a tie when all substrate changes into product,all enzyme substrate complex changes into product and the graph is flat,y-axis value reaches 0.

 

[Hisham Khan]

Look A isin't correct because if you look carefully,you will see that the graph doesent reach 0.As conc of substrate is LITTLE in excess and enzyme remain unchanged no matter how many complexes form,there will be a tie when all substrate changes into product,all enzyme substrate complex changes into product and the graph is flat,y-axis value reaches 0.

maybe if something happened to enzymes the graph would be like a,for e.g it denatures so conc would not reach 0

 

[Hisham Khan]

And one more thing...first es complexes will form and then they will break...this will happen with tym

Yes they do form but if they don't reach 0 over time with enzyme having no pain in the *** is something quite strange