who is ready for the exam?

[lexitu]

As in, I mean, even now, I still am convinced that the most appropriate answer was not the one that VCAA had picked as the correct answer (and I'm not interested in what the enzyme of the bacterium's optimal temperature is, I'm interested in the concept that they were supposedly testing) - I thought the concept was that enzyme function can vary greatly and that not all enzymes are similar to human enzymes.

@ Russ - I'm happy to agree to disagree

[Kaille]

Oh, never thought of it that way. but hey you'd probably be a better judge on bio questions than me any day.

[manniet]

Has anyone done the 2010 exam as practice?
We did it in class last week, and I only got 58%! Ran out of time and dropped a fair few marks due to that.
I found it difficult though.

[Zebra]

GG

[jenerator]

yeah, for the insight 2011 paper we did in class, there was a question about enzymes in detergent. And it asked why it worked better in cold water... I couldnt answer that question it a wtf moment

[jenerator]

i would upload it if i had another copy without pen marks.

anyway if u wanted the question, it asked
The washing detergent industry is the largest purchaser of enzymes in the world. Commonly proteases and amyleases are used to remove a wide variety of marks including blood and grass stains. For most detergents enzymes are only present at approx 0.4%
a). explain why it is unnecessary for detergents to contain high concentrations of enzymes.
b). The use of hot water has traditionally enabled soaps and detergents to lift stains from clothes. Explain why it has become increasingly necessary to wash clothes in cold water
c) currently the most common enzymes used in detergents are proteases and amyleases. An early example of a detergent that utilised lipases needed to be withdrawn from the market because it caused cellular damage. Identify the most likely location of cellular damage caused by these detergents. Justify your choice.
d) Early attempts to use proteases resulted in hypersensitivity reactions because of microscopic dust located on the surface of the detergent powder particles. What is a hypersensitivity reaction? Identify a possible improvement that could be made to the detergent to prevent these reactions from occuring.

[Charmz]

It would be because if you washed your clothes in hot water, you would denature the enzymes hence you wouldn't clean your clothes very well.

[jenerator]

tssm trial exam is up for you guys!

[Zebra]

got like 60 % in all my prac exams. no sign of improvement

[Christiano]

I've gone up from 60% to about B+ level .. Haven't reached an A yet Done about 12 so far ..

[Bing 101]

no, I'm starting to doubt if i ever will be :/

[epinephrine]

hmmm ... same I am soooo worried and nervous as it is my first year 12 exam