AS Biology paper 22 May 13th 2013

[Hassan Ali Abid]

im not losing hope......i have some silly mistakes thats why im worried a bit

in that smoking part i wrote that smoking causes coughing and then i wrote how that cough causes TB ....not sure if im rite

 

[Jinkglex]

Keep in mind the question asked us to DESCRIBE the difference as well!

Secondly, the sequence for heart beat was :

SAN sends signal -> atria contract -> avn sends signal -> Purkyne send signal -> ventricals contract

 

[Jinkglex]

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 }

 

[Hassan Ali Abid]

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 }

wth ....i was confused and i did this part wrong

 

[Rommarrooo]

What about the list of disacchrides you had to label?

 

[Hassan Ali Abid]

Keep in mind the question asked us to DESCRIBE the difference as well!

Secondly, the sequence for heart beat was :

SAN sends signal -> atria contract -> avn sends signal -> Purkyne send signal -> ventricals contract

was this question in 22 ppr ?????

 

[Rommarrooo]

And how does cold temperature affect the mode of enzymes. Generally I would have written about rates of reaction, however it said that after very low temperatures, the enzyme stopped working completely, this would infer something happening to the structure rather than amount of collisions?

 

[Jinkglex]

Yes, it was one of the last questions.

The disaccharides according to me were: cellobiose, sucrose, maltose, trehalose, from A down D.

 

[Rommarrooo]

Yes, that was the last question, I nearly didnt do it, It was after a blank page, i noticed it on re-checking. Shukar Alhamdulillah.

 

[Jinkglex]

And how does cold temperature affect the mode of enzymes. Generally I would have written about rates of reaction, however it said that after very low temperatures, the enzyme stopped working completely, this would infer something happening to the structure rather than amount of collisions?

I just wrote what happens in natural denaturation, nothing else was really making any sense.

 

[Rommarrooo]

Are you sure about trehalose, i remember it being more of the center ones. It was made up of alpha glucoses?

 

[Hassan Ali Abid]

heart wala sawal kab aye tha ppr main .... i didnt see that r u sure that that there was a question about heart

 

[Jinkglex]

It was indeed made of alpha glucose but the very last sugar was an alpha glucose pair as well, and as far as i remember, the structure was not one likely of maltose or sucrose.

Actually, here you go:

http://upload.wikimedia.org/wikipedia/commons/0/09/Trehalose_Haworth.svg

Shows that trehalose has a 5 carbon sugar and a 6 carbon sugar.

 

[rabos1]

I just wrote what happens in natural denaturation, nothing else was really making any sense.

I wrote Yahi answer.. but my friend was saying k at low temp enzymes are inactive, ISI liay they stopped working.. denaturation takes place at high temp.. remember?

What about reason of changing surface antigen?

 

[Jinkglex]

heart wala sawal kab aye tha ppr main .... i didnt see that r u sure that that there was a question about heart

Hassan it was question number 6 in variant 22....are you sure you did variant 22?

 

[Rommarrooo]

Aw, well there goes a couple of marks. Yes heart question tha. Pakka. Sorry.

 

[Hassan Ali Abid]

Hassan it was question number 6 in variant 22....are you sure you did variant 22?

yea i gave 22 vari ..... i didnt see this ques :O .....question kia tha :O ....kis page pr tha and kis baray main tha ....plzz tell me

 

[Jinkglex]

I wrote Yahi answer.. but my friend was saying k at low temp enzymes are inactive, ISI liay they stopped working.. denaturation takes place at high temp.. remember?

What about reason of changing surface antigen?

That made no sense . Explain?

And the surface antigens one was so annoying because of such little space -_- it was basically that vaccine exposes the body to one kind of antigen and if the disease carrier changes his antigens then its effectively a new disease as B lymphocytes are specific, so primary response must be repeated, making the vaccine a waste.

 

[Rommarrooo]

Differences between replication and transcription, just to be sure. I didnt do many pastpapers, so rattay huay nahi thay answer.

 

[Rommarrooo]

ALSO. VACCINES ARE ARTIFICIAL PASSIVE OR ARTIFICIAL ACTIVE?