AS Biology paper 22 May 13th 2013

[rabos1]

Yes the enzyme is inactive, but we had to describe why it was inactive. There wasnt really any other viable definition coming to mind considering he said the enzymes never worked even when returned to their normal working temperatures. We were only taught one definition in the syllabus, that of normal denaturation. I dont think low temp inactivity applies here because we can recover from that

Toh according to you enzyme walay question mein, first part and last part had same answers? Almost same answers, right?

 

[tanixx]

what were the first and third disacchrides?

 

[rabos1]

Toh according to you enzyme walay question mein, first part and last part had same answers? Almost same answers, right?

In both parts we had to discuss natural denaturation? ( even in freeze denaturation)

 

[h4rriet]

what were the first and third disacchrides?

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.

 

[minhal]

wot was the one in which the glycosidic bond was sort of slanting way..i think it was fourth diagram
nd wots the answer to epidimological thng?

 

[h4rriet]

wot was the one in which the glycosidic bond was sort of slanting way..i think it was fourth diagram
nd wots the answer to epidimological thng?

The 1st sugar was maltose, the 2nd trehalose, the 3rd cellobiose the 4th sucrose.
In the epidemiological question, you had to say something to the effect of that when the number of smokers increases, the number of TB cases reported also increases.

 

[minhal]

[/qu

The 1st sugar was maltose, the 2nd trehalose, the 3rd cellobiose the 4th sucrose.
In the epidemiological question, you had to say something to the effect of that when the number of smokers increases, the number of TB cases reported also increases.

how was 3rd cellobiose? isnt that suposd to b where sugars are 180 degrees rotated?

 

[h4rriet]

[/qu
how was 3rd cellobiose? isnt that suposd to b where sugars are 180 degrees rotated?

The 3rd was a disaccharide of B-glucose.

 

[rabos1]

The 1st sugar was maltose, the 2nd trehalose, the 3rd cellobiose the 4th sucrose.
In the epidemiological question, you had to say something to the effect of that when the number of smokers increases, the number of TB cases reported also increases.

What about enzyme question? In first and last part we had to discuss simple denaturation, that is shape of active site changes, blah blah?

 

[h4rriet]

What about enzyme question? In first and last part we had to discuss simple denaturation, that is shape of active site changes, blah blah?

The first asked for the mode of action of the enzyme; you had to say that the substrate is complementary to the active site, that an E-S complex forms, and that the enzyme remains unaltered at the end, etc.
In the second, you had to talk about the denaturation of the active site.

 

[rabos1]

The first asked for the mode of action of the enzyme; you had to say that the substrate is complementary to the active site, that an E-S complex forms, and that the enzyme remains unaltered at the end, etc.
In the second, you had to talk about the denaturation of the active site.

Nai there were three parts, mode of action was part b... I'm talking about part a and part c?

 

[Hassan Ali Abid]

Nai there were three parts, mode of action was part b... I'm talking about part a and part c?

mode of action was the first part

 

[rabos1]

mode of action was the first part

Nai in first part they asked, at very low temp we freeze enzyme.. when enzymes are put in normal working temp, they stop working completely, explain this? This was part a

 

[Hassan Ali Abid]

acha ....i thought this was 2nd part

 

[rabos1]

acha ....i thought this was 2nd part

Toh freeze denaturation aur ISS part ka same answer Tha?

 

[Hassan Ali Abid]

mujy tension sai sab bhool gia hai so its better k app kis aur sai puch lo .....im just totally out of my mind

 

[prettypearlshy]

Smoking caused TB because:

1) the tar paralyzed cilia and incites mucus production enabling the TB pathogen to live in the mucus and grow. Carbon Monoxide would also combine with Heamoglobin giving carboxyheamoglobin, impairing the bodies ability to transport oxygen and inducing lethargy.

Heart muscle is thicker on left side due to having to put in more pressure as it pumps over longer distances {I think everyone ratta'd this one }

i was confused with the whole smoking and TB thing,but i wrote this answer so im having a little hope that i'll score something from that question

 

[prettypearlshy]

ALSO. VACCINES ARE ARTIFICIAL PASSIVE OR ARTIFICIAL ACTIVE?

its artificial active...but i forgot it during the exam

 

[jerray]

I was actually quite confused when I read the disaccharide question; I figured that the first two were combinations of alpha glucose and wasn't sure which one to put down. but when I realised that maltose (made from amylose-which was what the bullet point in the question stated or something like that) must have a 1-4 glycosidic linkage due to the fact its made from amylose, I put B down as maltose and A down as trehalose.

and also because A looked like this:
http://upload.wikimedia.org/wikipedia/commons/0/09/Trehalose_Haworth.svg

someone correct me if I'm wrong?

 

[rabos1]

its artificial active...but i forgot it during the exam

I wrote articial passive