AS Biology paper 22 May 13th 2013

[terry jefferson]

sucrose was D

when i look it up on google it shows that both sucrose and maltose have the same structure....maybe thats why it was only 3 marks....they will mark sucrose and maltose together.....anyways i hope sucrose was A

 

[Waleed Amjad]

The first was maltose, the second trehalose and the last sucrose. Don't remember the name of the fourth, but it was the third structure.

Cellibose

 

[Waleed Amjad]

I think it was 13.

I don't remember.. your measurement and then convert it to micrometers.. and then we were supposed to divide it by magnification given.. this is what you did?

I wrote for cancerous cells, uncontrolled cell division takes place so we need more mitochondria to provide atp and rer for modifiation of proteins and blah blah.

Yeah 13.0 Micrometers. i got that too.

 

[Malik777]

I had confirmed from my Biology teacher
C- Cellibose.
D- maltose.
A- Maltose
B- Sucrose

 

[rabos1]

I had confirmed from my Biology teacher
C- Cellibose.
D- maltose.
A- Maltose
B- Sucrose

You missed one. How come maltose two times?

 

[Malik777]

You missed one. How come maltose two times?

D-Maltose
A-Trehalose

 

[rabos1]

You missed one. How come maltose two times?

And answer of enzyme question part a and part c?

Ie a) at very low and even when temp was increased to enzymes working temperatures, enzymes stopped working completely, explain this?

C) freeze denaturation?

 

[Malik777]

And answer of enzyme question part a and part c?

Ie a) at very low and even when temp was increased to enzymes working temperatures, enzymes stopped working completely, explain this?

C) freeze denaturation?

At low temperature the Kinetic energy decrease hence the collisions decrease there would be less frequent collisions so less chance to form ES-Complex. Enzyme partially denatured. Sometimes due to so less KE the H bonds break the tertiary globular structure of enzyme distorted. Active site lost

 

[rabos1]

At low temperature the Kinetic energy decrease hence the collisions decrease there would be less frequent collisions so less chance to form ES-Complex. Enzyme partially denatured. Sometimes due to so less KE the H bonds break the tertiary globular structure of enzyme distorted. Active site lost

This is part A or C? denaturation never occurs at low temp!

 

[Malik777]

This is part A or C? denaturation never occurs at low temp!

Thoug it never occurs but they told this in question so we have to denature it

 

[rabos1]

At low temperature the Kinetic energy decrease hence the collisions decrease there would be less frequent collisions so less chance to form ES-Complex. Enzyme partially denatured. Sometimes due to so less KE the H bonds break the tertiary globular structure of enzyme distorted. Active site lost

We never studied what happens at low temp, just studied enzymes are inactive at low temp!

 

[Malik777]

We never studied what happens at low temp, just studied enzymes are inactive at low temp!

But they told in paper it becomes denatured :/

 

[tanixx]

D-Maltose
A-Trehalose

wasnt D sucrose?

 

[Malik777]

wasnt D sucrose?

Yup D was Sucrose and B was Maltose sorry dude it was my faulty Typing and tiredness of exams

 

[Waleed Amjad]

This is part A or C? denaturation never occurs at low temp!

All enzymes degrade at a low or high enough temperature. The variations are dependent on the enzyme itself. Also some enzymes are permanently denatured while others refold when introduced back into normal conditions.

 

[Malik777]

Hey any way any guess for practical /33 ?: O

 

[Muhammad TAimoor]

yaar kitnay marks ka tha ......last page was blank and i saw that ........
pura question tha aur it was a subpart...............

there was a part of CHD treatment and i did that but idk about this ventricle stufff

Bohat Alaa, Man!
Pura question hi Waarr diya

 

[songjihyo]

That actually has more logic to it than anything I came up with. Good job

hahahahaha thanks man.. but wt did u write? :/

 

[songjihyo]

OMG ...i just realised i used inches ruler not cm ruler....omg how many marks did it have???

it was 2 marks, i remember

 

[songjihyo]

At low temperature the Kinetic energy decrease hence the collisions decrease there would be less frequent collisions so less chance to form ES-Complex. Enzyme partially denatured. Sometimes due to so less KE the H bonds break the tertiary globular structure of enzyme distorted. Active site lost

um, i didnt write anything about kinetic energy or collisions though :/, i wrote that the low temperature causes the ionic bond to break (because i thought if it had to do with temperature the bonds that break will be ionic and hydrogen bonds, but for some reason i just wrote for ionic) and so this causes the active site to change shape, therefore active site is no longer complementary to the substrate and ES complex can no longer be formed. aihh, u think this is right? omaigoooooooooooooooooooood. stress. haha