BIOLOGY P33 GUESS NEEDED!!!!HELP PLEASE!!!07 NOV 2013 !!! 9709/33

[Sheikh Nahiyan]

Yes Q2 the practical part was easy , the questions weren't hat easy .. i hope i did them well though .. and yes the comparison was a bit confusing x_x
Q1 i messed up in one of the concentrations /: and the other questions i hope i wrote correct answers /: those theory-like questions scare me x_x
anyways .. lets hope the thresholds are as low was may/june 2013 or even lower :'o

Theory-like questions are easy. They are like solid guaranteed marks
I dont know what the threshold will be like.. if it's like 25-28 for A then all is well

 

[Tirtho Sarker]

Okay... So the exam went pretty okayish...

Question 2 was easy to be honest. But I am confused about the comparison part. :|

Question 1 was easy as I didnt spend much time doing the experiment.. The latter part of question was best to be honest.. I guess I did all thing right in that part.. And as for the experiment, as the concentration increased, time decreased.

i messed up with the trend. my time increased with concentration..how much do you think will be deducted? :/

 

[Sheikh Nahiyan]

i messed up with the trend. my time increased with concentration..how much do you think will be deducted? :/

according to the experiment, the calculated time should decrease with the increase in concentration.. i dont know. you did the whole thing wrong so they will deduct the whole mark of the experiment.. most probably 5-6

 

[rehmanmunir]

according to the experiment, the calculated time should decrease with the increase in concentration.. i dont know. you did the whole thing wrong so they will deduct the whole mark of the experiment.. most probably 5-6

expirment box was about five mark if u made table and heading u got 2/5 marks

 

[rabos1]

according to the experiment, the calculated time should decrease with the increase in concentration.. i dont know. you did the whole thing wrong so they will deduct the whole mark of the experiment.. most probably 5-6

I did estimation.. but I wrote readings in decreasing order I.e time decreases as concur increases. No, why 6? They'll cut hardly 1-2 Mark.. not

Readings don't have so many marks.. not sure if is not right... Anyway, presentation of data is more important in bio practical .

 

[rabos1]

Not sure if trend is not correct*

 

[rabos1]

according to the experiment, the calculated time should decrease with the increase in concentration.. i dont know. you did the whole thing wrong so they will deduct the whole mark of the experiment.. most probably 5-6

What readings you got by the way?

 

[Rosy S]

For greatest percent my total time for complete reaction was only 12s .. and least percent I had about 122s

What readings you got by the way?

What about you guys??

 

[rabos1]

For greatest percent my total time for complete reaction was only 12s .. and least percent I had about 122s
What about you guys??

My for least conc was 320 sec and for highest conc was 122 sec.. I just estimated.. because firstly my solutions never turned pink...

 

[Nisa Mirza]

You should have made the chart.. I dont know. They should give you 1mark for labelling the axes. Significant error in which one? Oh.. yeah.. those two? I gave error while preparing the different concentrations of the solutions.. And for the variables i wrote; use of a water bath to maintain temperature. use of buffer to maintain pH and another one i cant remember.. :\

For error i wrote that the enzyme was not at the same initial temp.. Does that sound legit?

 

[Nisa Mirza]

My for least conc was 320 sec and for highest conc was 122 sec.. I just estimated.. because firstly my solutions never turned pink...

same here. Those things took a really long time to change colour. I had >300s for the first 3 concentrations and about 287s for the highest conc. All crooked up!!

 

[Sheikh Nahiyan]

I did estimation.. but I wrote readings in decreasing order I.e time decreases as concur increases. No, why 6? They'll cut hardly 1-2 Mark.. not

Readings don't have so many marks.. not sure if is not right... Anyway, presentation of data is more important in bio practical .

What readings you got by the way?

I guess you did t right then They will only deduct a mark or two.. And me? For the highest concentration I got 18seconds, for the 2nd one 37second, then 63second, then for the next one 95second and the last one more than 300 i guess

 

[Sheikh Nahiyan]

For error i wrote that the enzyme was not at the same initial temp.. Does that sound legit?

Initial temperature was 50degreeC right?? So if you say that then the enzyme is supposed to get denatured at that temperature right?? So I am not sure but then again you could have said that the temperature of the enzyme solution was not at its optimum.. right? :\

 

[Nisa Mirza]

ho

Initial temperature was 50degreeC right?? So if you say that then the enzyme is supposed to get denatured at that temperature right?? So I am not sure but then again you could have said that the temperature of the enzyme solution was not at its optimum.. right? :\

Like u know we were supposed to maintain the mixture at between 45 to 50 *C. But then when we added the enzyme, that enzyme was not at the same temperature as the mixture. We started timing immediately then, but an error could arise since there was energy lost (and some time was wasted in the energy changes). So the time we got wasnt really accurate. i hope all this jibberish makes sense

 

[Sheikh Nahiyan]

ho
Like u know we were supposed to maintain the mixture at between 45 to 50 *C. But then when we added the enzyme, that enzyme was not at the same temperature as the mixture. We started timing immediately then, but an error could arise since there was energy lost (and some time was wasted in the energy changes). So the time we got wasnt really accurate. i hope all this jibberish makes sense

Your one makes sense now.. But it is so long and lengthy... I hope they accept both and give us the marks