ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Biology => Topic started by: panicatthelunchbar on March 10, 2011, 07:26:54 pm

Title: SAC 2?!!!?
Post by: panicatthelunchbar on March 10, 2011, 07:26:54 pm: Hi everyone,

What are you guys doing for your second SAC? Enzymes?
Also, the students from 2010 Year 12 Biol class, what did you guys do as SAC 2 last year?

Any advice, comments?

Thanks! :)
Title: Re: SAC 2?!!!?
Post by: pi on March 10, 2011, 09:14:49 pm: I did something about investigating the actions and effect of temperature on catalase and diastase (ie. amylase). To be honest, it was a fairly dull prac.
Title: Re: SAC 2?!!!?
Post by: scocliffe09 on March 10, 2011, 09:20:26 pm: We measured the effect of temperature on the functioning of catalase in potatoes - very similar prac to Rohitpi.
Advice? Make sure you understand and can explain terms such as:
organic catalyst
enzyme-substrate complex
lock and key model vs induced fit model
active site
Denaturing - remember that enzymes are proteins
activation energy

Understand and be able to draw graphs demonstrating the effect of substrate or enzyme concentration, temperature and pH on reaction rate. Be able to design and explain experiments testing each of these concepts
Title: Re: SAC 2?!!!?
Post by: panicatthelunchbar on March 15, 2011, 10:04:24 pm: Hi scocliffe09,

Can you please explain what the terms organic catalyst and enzyme-substrate complex mean? I get very confused :/
Is organic catalyst basically a catalyst which can be denatured? I don't understand the organic part of it??

Thanks
Title: Re: SAC 2?!!!?
Post by: Greatness on March 15, 2011, 10:12:08 pm: Isnt an organic catalyst like a protein?
Enzyme substrate complex is like how the enzyme and substrate bind together?
Title: Re: SAC 2?!!!?
Post by: HERculina on March 15, 2011, 11:19:01 pm: organic catalyst = catalyst made of protein (an organic molecule) = enzymes!
btw are all our sacs gonna be pracs?
i dont like answering prac-type q.s :/
Title: Re: SAC 2?!!!?
Post by: pi on March 16, 2011, 05:19:55 pm: Quote from: Bazza16 on March 16, 2011, 07:12:18 am
varies from school to school. IN unit 3 MHS has 2 pracs, 1 test about a prac, and one website i think

DAMN THAT WEBSITE!
Title: Re: SAC 2?!!!?
Post by: pi on March 16, 2011, 05:28:34 pm: Quote from: Bazza16 on March 16, 2011, 05:24:38 pm
lol . In year 10 we had one of the library people tell us how to make a website using dreamweaver.
I spent 10 hours and couldn't make an pages at all O.o

I got taught HTML in Uni High when Frontpage dies, so I just HTML'ed it and picked a cool theme. Just a bad SAC though, really pointless
Title: Re: SAC 2?!!!?
Post by: Truck on March 16, 2011, 10:39:23 pm: Quote from: Bazza16 on March 16, 2011, 05:30:11 pm
Glad i made the mistake in yr 10 than in 3/4 bio though !

True that, wix ftw when it comes to building website projects.
Title: Re: SAC 2?!!!?
Post by: scocliffe09 on March 16, 2011, 10:47:17 pm: Quote from: panicatthelunchbar on March 15, 2011, 10:04:24 pm
Hi scocliffe09,

Can you please explain what the terms organic catalyst and enzyme-substrate complex mean? I get very confused :/
Is organic catalyst basically a catalyst which can be denatured? I don't understand the organic part of it??

Thanks
organic = contains Carbon and Hydrogen, usually a complex molecule. Many catalysts are simpler molecules (metal ions for example) so enzymes are distinguished as being organic - and yes, they are proteins, a type of organic molecule.
catalyst - substance which speeds up a chemical reaction by lower its activation energy without being used up itself

substrates bind to the active site of the enzyme. At the point when the substrate is bound to the enzyme, an Enzyme-substrate complex is formed. this then splits into the products and enzyme again.
Title: Re: SAC 2?!!!?
Post by: Russ on March 17, 2011, 08:35:21 am: I suppose it should be said that not all enzymes are proteins but I don't think that's terribly important
Title: Re: SAC 2?!!!?
Post by: Arju94 on March 17, 2011, 09:57:58 am: Alrite so our school is being gay :knuppel2: and havent told us what prac it is, but I do know that its going to be looking at how ph and tempretures affect enzymes, thats because we went through working with data loggers-what do you guys reckon the prac is, the types of graphs formed and the types of questions that would be given
Title: Re: SAC 2?!!!?
Post by: Truck on March 17, 2011, 04:24:46 pm: Quote from: Russ on March 17, 2011, 08:35:21 am
I suppose it should be said that not all enzymes are proteins but I don't think that's terribly important

So would you still define a Ribosome as an enzyme?
Title: Re: SAC 2?!!!?
Post by: Russ on March 17, 2011, 04:44:31 pm: Oh wow, I'd never actually thought about it like that before but yeah, I would.
Title: Re: SAC 2?!!!?
Post by: dooodyo on March 19, 2011, 12:57:47 am: I thought ribosomes aren't enzymes but instead ribozymes are the non-protein catalysts.
Title: Re: SAC 2?!!!?
Post by: Russ on March 19, 2011, 09:49:28 am: Yeah I guess if you want more detail, ribosomes are associations that contain RNA enzymes
Title: Re: SAC 2?!!!?
Post by: WhoTookMyUsername on March 20, 2011, 06:24:19 pm: Do Inorganic Catalysts always get used up in a reaction? My bio teacher said they do, but i'm not sure (campbells suggests otherwise)